Makes boxing helper methods private.

Change-Id: I2f4ca00cbff1e20653acc17cc885e993532e9d66
diff --git a/user/super/com/google/gwt/emul/java/lang/Boolean.java b/user/super/com/google/gwt/emul/java/lang/Boolean.java
index fee3759..d031414 100644
--- a/user/super/com/google/gwt/emul/java/lang/Boolean.java
+++ b/user/super/com/google/gwt/emul/java/lang/Boolean.java
@@ -124,21 +124,21 @@
 
   // CHECKSTYLE_OFF: Utility Methods for unboxed Boolean.
   @JsMethod(name = "$create__boolean")
-  static Boolean $createBoolean(boolean x) {
+  private static Boolean $createBoolean(boolean x) {
     return createNative(x);
   }
 
   @JsMethod(name = "$create__java_lang_String")
-  static Boolean $createBoolean(String x) {
+  private static Boolean $createBoolean(String x) {
     return createNative(Boolean.parseBoolean(x));
   }
 
-  static native Boolean createNative(boolean x) /*-{
+  private static native Boolean createNative(boolean x) /*-{
     return x;
   }-*/;
 
   @JsMethod
-  static boolean $isInstance(Object instance) {
+  private static boolean $isInstance(Object instance) {
     return "boolean".equals(JsUtils.typeOf(instance));
   }
   //CHECKSTYLE_ON: End utility methods
diff --git a/user/super/com/google/gwt/emul/java/lang/Double.java b/user/super/com/google/gwt/emul/java/lang/Double.java
index 13f0216..5db5b0b 100644
--- a/user/super/com/google/gwt/emul/java/lang/Double.java
+++ b/user/super/com/google/gwt/emul/java/lang/Double.java
@@ -370,21 +370,21 @@
 
   // CHECKSTYLE_OFF: Utility Methods for unboxed Double.
   @JsMethod(name = "$create__double")
-  static Double $createDouble(double x) {
+  private static Double $createDouble(double x) {
     return createNative(x);
   }
 
   @JsMethod(name = "$create__java_lang_String")
-  static Double $createDouble(String s) {
+  private static Double $createDouble(String s) {
     return createNative(Double.parseDouble(s));
   }
 
-  static native Double createNative(double x) /*-{
+  private static native Double createNative(double x) /*-{
     return x;
   }-*/;
 
   @JsMethod
-  static boolean $isInstance(Object instance) {
+  private static boolean $isInstance(Object instance) {
     return "number".equals(JsUtils.typeOf(instance));
   }
   //CHECKSTYLE_ON: End utility methods
diff --git a/user/super/com/google/gwt/emul/java/lang/String.java b/user/super/com/google/gwt/emul/java/lang/String.java
index d3c877e..2a31e81 100644
--- a/user/super/com/google/gwt/emul/java/lang/String.java
+++ b/user/super/com/google/gwt/emul/java/lang/String.java
@@ -766,55 +766,55 @@
   // CHECKSTYLE_OFF: Utility Methods for unboxed String.
 
   @JsMethod(name = "$create")
-  static String $createString() {
+  private static String $createString() {
     return "";
   }
 
   @JsMethod(name = "$create__arrayOf_byte")
-  static String $createString(byte[] bytes) {
+  private static String $createString(byte[] bytes) {
     return $createString(bytes, 0, bytes.length);
   }
 
   @JsMethod(name = "$create__arrayOf_byte__int__int")
-  static String $createString(byte[] bytes, int ofs, int len) {
+  private static String $createString(byte[] bytes, int ofs, int len) {
     return $createString(bytes, ofs, len, EmulatedCharset.UTF_8);
   }
 
   @JsMethod(name = "$create__arrayOf_byte__int__int__java_lang_String")
-  static String $createString(byte[] bytes, int ofs, int len, String charsetName)
+  private static String $createString(byte[] bytes, int ofs, int len, String charsetName)
       throws UnsupportedEncodingException {
     return $createString(bytes, ofs, len, String.getCharset(charsetName));
   }
 
   @JsMethod(name = "$create__arrayOf_byte__int__int__java_nio_charset_Charset")
-  static String $createString(byte[] bytes, int ofs, int len, Charset charset) {
+  private static String $createString(byte[] bytes, int ofs, int len, Charset charset) {
     return String.valueOf(((EmulatedCharset) charset).decodeString(bytes, ofs, len));
   }
 
   @JsMethod(name = "$create__arrayOf_byte__java_lang_String")
-  static String $createString(byte[] bytes, String charsetName)
+  private static String $createString(byte[] bytes, String charsetName)
       throws UnsupportedEncodingException {
     return $createString(bytes, 0, bytes.length, charsetName);
   }
 
   @JsMethod(name = "$create__arrayOf_byte__java_nio_charset_Charset")
-  static String $createString(byte[] bytes, Charset charset)
+  private static String $createString(byte[] bytes, Charset charset)
       throws UnsupportedEncodingException {
     return $createString(bytes, 0, bytes.length, charset.name());
   }
 
   @JsMethod(name = "$create__arrayOf_char")
-  static String $createString(char value[]) {
+  private static String $createString(char value[]) {
     return String.valueOf(value);
   }
 
   @JsMethod(name = "$create__arrayOf_char__int__int")
-  static String $createString(char value[], int offset, int count) {
+  private static String $createString(char value[], int offset, int count) {
     return String.valueOf(value, offset, count);
   }
 
   @JsMethod(name = "$create__arrayOf_int__int__int")
-  static String $createString(int[] codePoints, int offset, int count) {
+  private static String $createString(int[] codePoints, int offset, int count) {
     char[] chars = new char[count * 2];
     int charIdx = 0;
     while (count-- > 0) {
@@ -824,22 +824,22 @@
   }
 
   @JsMethod(name = "$create__java_lang_String")
-  static String $createString(String other) {
+  private static String $createString(String other) {
     return other;
   }
 
   @JsMethod(name = "$create__java_lang_StringBuffer")
-  static String $createString(StringBuffer sb) {
+  private static String $createString(StringBuffer sb) {
     return String.valueOf(sb);
   }
 
   @JsMethod(name = "$create__java_lang_StringBuilder")
-  static String $createString(StringBuilder sb) {
+  private static String $createString(StringBuilder sb) {
     return String.valueOf(sb);
   }
 
   @JsMethod
-  static boolean $isInstance(Object instance) {
+  private static boolean $isInstance(Object instance) {
     return "string".equals(JsUtils.typeOf(instance));
   }
   // CHECKSTYLE_ON: end utility methods