Do not export non public fields of JsExport concrete class.

Missed checking the visibility of fields in a JsExport class so that
all static fields were exported.
This patch fixes the bug so that only fields that are public static
are exported when the class is JsExport.

Change-Id: If147d9fce97fd48358a37db26d5f5ca758c9b5c3
diff --git a/dev/core/src/com/google/gwt/dev/jjs/impl/GwtAstBuilder.java b/dev/core/src/com/google/gwt/dev/jjs/impl/GwtAstBuilder.java
index 8207731..bdf70ad 100644
--- a/dev/core/src/com/google/gwt/dev/jjs/impl/GwtAstBuilder.java
+++ b/dev/core/src/com/google/gwt/dev/jjs/impl/GwtAstBuilder.java
@@ -2501,7 +2501,7 @@
           if (f.getExportName() != null) {
             continue;
           }
-          if (f.isStatic()) {
+          if (f.isPublic() && f.isStatic()) {
             f.setExportName("");
           }
         }
diff --git a/user/test/com/google/gwt/core/client/interop/JsExportTest.java b/user/test/com/google/gwt/core/client/interop/JsExportTest.java
index a8563a9..822b3cf 100644
--- a/user/test/com/google/gwt/core/client/interop/JsExportTest.java
+++ b/user/test/com/google/gwt/core/client/interop/JsExportTest.java
@@ -101,7 +101,9 @@
 
   private native Object getNotExportedFields() /*-{
     return $wnd.woo.StaticInitializerStaticField.NOT_EXPORTED_1
-        || $wnd.woo.StaticInitializerStaticField.NOT_EXPORTED_2;
+        || $wnd.woo.StaticInitializerStaticField.NOT_EXPORTED_2
+        || $wnd.woo.StaticInitializerStaticField.NOT_EXPORTED_3
+        || $wnd.woo.StaticInitializerStaticField.NOT_EXPORTED_4;
   }-*/;
 
   private native Object getNotExportedMethods() /*-{
diff --git a/user/test/com/google/gwt/core/client/interop/StaticInitializerStaticField.java b/user/test/com/google/gwt/core/client/interop/StaticInitializerStaticField.java
index 572c3e4..1bd56d9 100644
--- a/user/test/com/google/gwt/core/client/interop/StaticInitializerStaticField.java
+++ b/user/test/com/google/gwt/core/client/interop/StaticInitializerStaticField.java
@@ -34,6 +34,12 @@
   // Not static
   public final Object NOT_EXPORTED_2 = new Object();
 
+  // Not public
+  static final Object NOT_EXPORTED_3 = new Object();
+
+  // Not public
+  private static final Object NOT_EXPORTED_4 = new Object();
+
   /**
    * Test interface that export a static field.
    */