Move the Widget hierarchy to the Oilpan heap.

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 3795 matching lines @@
     EXPECT_TRUE(mainFrame->find(kFindIdentifier, searchText, options, false, 0));
 
     mainFrame->resetMatchCount();
     mainFrame->scopeStringMatches(kFindIdentifier, searchText, options, true);
 
     runPendingTasks();
     EXPECT_TRUE(client.findResultsAreReady());
 
     // Get the tickmarks for the original find request.
     FrameView* frameView = webViewHelper.webViewImpl()->mainFrameImpl()->frameView();
-    RefPtr<Scrollbar> scrollbar = frameView->createScrollbar(HorizontalScrollbar);
+    RefPtrWillBeRawPtr<Scrollbar> scrollbar = frameView->createScrollbar(HorizontalScrollbar);
     Vector<IntRect> originalTickmarks;
     scrollbar->getTickmarks(originalTickmarks);
     EXPECT_EQ(4u, originalTickmarks.size());
 
     // Override the tickmarks.
     Vector<IntRect> overridingTickmarksExpected;
     overridingTickmarksExpected.append(IntRect(0, 0, 100, 100));
     overridingTickmarksExpected.append(IntRect(0, 20, 100, 100));
     overridingTickmarksExpected.append(IntRect(0, 30, 100, 100));
     mainFrame->setTickmarks(overridingTickmarksExpected);
@@ skipping 2802 matching lines @@
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 
     // Neither should a page reload.
     localFrame->reload();
     EXPECT_EQ(4u, frameClient.provisionalLoadCount());
     EXPECT_FALSE(frameClient.wasLastProvisionalLoadATransition());
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 }
 
 } // namespace