Fix typo in windowonerror property name

Change-Id: I5cf0c2c7a1f5c35393cd08a3f06c53f90a045cd5

user/src/com/google/gwt/core/Core.gwt.xml

diff --git a/user/src/com/google/gwt/core/Core.gwt.xml b/user/src/com/google/gwt/core/Core.gwt.xml
index cff43a5..5fcc52b 100644
--- a/user/src/com/google/gwt/core/Core.gwt.xml
+++ b/user/src/com/google/gwt/core/Core.gwt.xml
@@ -91,8 +91,8 @@
      - Only trap window.onerror if there is no current window.onerror handler (REPORT_IF_NO_HANDLER)
      - Do not trap anything (legacy behavior) (IGNORE)
   -->
-  <define-property name="gwt.uncaughtexceptionhander.windowonerror" values="IGNORE, REPORT, REPORT_IF_NO_HANDLER" />
-  <set-property name="gwt.uncaughtexceptionhander.windowonerror" value="IGNORE"/>
+  <define-property name="gwt.uncaughtexceptionhandler.windowonerror" values="IGNORE, REPORT, REPORT_IF_NO_HANDLER" />
+  <set-property name="gwt.uncaughtexceptionhandler.windowonerror" value="IGNORE"/>
 
   <!-- To support legacy logging flags -->
   <inherits name="com.google.gwt.logging.LogImpl"/>

user/src/com/google/gwt/core/client/impl/Impl.java

diff --git a/user/src/com/google/gwt/core/client/impl/Impl.java b/user/src/com/google/gwt/core/client/impl/Impl.java
index 5ca81a0..af2769d 100644
--- a/user/src/com/google/gwt/core/client/impl/Impl.java
+++ b/user/src/com/google/gwt/core/client/impl/Impl.java
@@ -173,7 +173,7 @@
   private static boolean onErrorInitialized;
 
   public static void maybeInitializeWindowOnError() {
-    if ("IGNORE".equals(System.getProperty("gwt.uncaughtexceptionhander.windowonerror"))) {
+    if ("IGNORE".equals(System.getProperty("gwt.uncaughtexceptionhandler.windowonerror"))) {
       return;
     }
     if (onErrorInitialized) {
@@ -182,7 +182,7 @@
     onErrorInitialized = true;
     boolean alwaysReport =
         "REPORT"
-            .equals(System.getProperty("gwt.uncaughtexceptionhander.windowonerror"));
+            .equals(System.getProperty("gwt.uncaughtexceptionhandler.windowonerror"));
     registerWindowOnError(alwaysReport);
   }