http://gwt-code-reviews.appspot.com/126812


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7553 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/src/com/google/gwt/user/History.gwt.xml b/user/src/com/google/gwt/user/History.gwt.xml
index bad06a1..3fd787c 100644
--- a/user/src/com/google/gwt/user/History.gwt.xml
+++ b/user/src/com/google/gwt/user/History.gwt.xml
@@ -30,7 +30,13 @@
 		</any>
   </replace-with>
 
-	<!-- Safari has yet another slightly different implementation. -->
+	<!-- Opera has yet another slightly different implementation. -->
+	<replace-with class="com.google.gwt.user.client.impl.HistoryImplTimer">
+		<when-type-is class="com.google.gwt.user.client.impl.HistoryImpl"/>
+		<when-property-is name="user.agent" value="opera"/>
+	</replace-with>
+
+	<!-- Safari is almost like Opera, but again slightly different. -->
 	<replace-with class="com.google.gwt.user.client.impl.HistoryImplSafari">
 		<when-type-is class="com.google.gwt.user.client.impl.HistoryImpl"/>
 		<when-property-is name="user.agent" value="safari"/>