Disabling a couple of tests in HtmlUnit due to sporadic failures.
http://gwt-code-reviews.appspot.com/300801/show

Review by: amitmanjhi@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@7855 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/test/com/google/gwt/emultest/java/util/TreeMapTest.java b/user/test/com/google/gwt/emultest/java/util/TreeMapTest.java
index 9e3e0f0..07251c9 100644
--- a/user/test/com/google/gwt/emultest/java/util/TreeMapTest.java
+++ b/user/test/com/google/gwt/emultest/java/util/TreeMapTest.java
@@ -17,6 +17,8 @@
 
 import com.google.gwt.core.client.GWT;
 import com.google.gwt.core.client.JavaScriptException;
+import com.google.gwt.junit.DoNotRunWith;
+import com.google.gwt.junit.Platform;
 
 import org.apache.commons.collections.TestMap;
 
@@ -1131,6 +1133,7 @@
    * @see java.util.Map#put(Object, Object)
    */
   @SuppressWarnings("unchecked")
+  @DoNotRunWith(Platform.HtmlUnitUnknown)
   public void testPut_throwsClassCastException_key() {
     // The _throwsUnsupportedOperationException version of this test will
     // verify that the method is not supported.
diff --git a/user/test/com/google/gwt/user/client/ui/PopupTest.java b/user/test/com/google/gwt/user/client/ui/PopupTest.java
index fd42c3d..7d4b0f6 100644
--- a/user/test/com/google/gwt/user/client/ui/PopupTest.java
+++ b/user/test/com/google/gwt/user/client/ui/PopupTest.java
@@ -20,6 +20,8 @@
 import com.google.gwt.dom.client.Element;
 import com.google.gwt.event.logical.shared.CloseEvent;
 import com.google.gwt.event.logical.shared.CloseHandler;
+import com.google.gwt.junit.DoNotRunWith;
+import com.google.gwt.junit.Platform;
 import com.google.gwt.junit.client.GWTTestCase;
 import com.google.gwt.user.client.History;
 import com.google.gwt.user.client.Timer;
@@ -162,6 +164,7 @@
    * behavior because, when we detach a {@link MenuBar} from the page, it closes
    * all of its sub menus, each located in a different {@link PopupPanel}.
    */
+  @DoNotRunWith(Platform.HtmlUnitUnknown)
   public void testDependantPopupPanel() {
     // Create the dependent popup
     final PopupPanel dependantPopup = createPopupPanel();