Move the Widget hierarchy to the Oilpan heap.

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 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 472 matching lines @@
 {
     m_client->setMouseOverURL(WebURL());
     PageWidgetEventHandler::handleMouseLeave(mainFrame, event);
 }
 
 void WebViewImpl::handleMouseDown(LocalFrame& mainFrame, const WebMouseEvent& event)
 {
     // If there is a popup open, close it as the user is clicking on the page (outside of the
     // popup). We also save it so we can prevent a click on an element from immediately
     // reopening the same popup.
-    RefPtr<PopupContainer> selectPopup;
+    RefPtrWillBeRawPtr<PopupContainer> selectPopup = nullptr;
     RefPtr<WebPagePopupImpl> pagePopup;
     if (event.button == WebMouseEvent::ButtonLeft) {
         selectPopup = m_selectPopup;
         pagePopup = m_pagePopup;
         hidePopups();
         ASSERT(!m_selectPopup);
         ASSERT(!m_pagePopup);
     }
 
     m_lastMouseDownPoint = WebPoint(event.x, event.y);
@@ skipping 229 matching lines @@
     switch (event.type) {
     case WebInputEvent::GestureTap: {
         m_client->cancelScheduledContentIntents();
         // FIXME: Use targeted event here and save another hit test.
         // FIXME: Content intent should be generated using same node that was highlighted. crbug.com/416746
         if (detectContentOnTouch(platformEvent.position())) {
             eventSwallowed = true;
             break;
         }
 
-        RefPtr<PopupContainer> selectPopup;
+        RefPtrWillBeRawPtr<PopupContainer> selectPopup = nullptr;
         selectPopup = m_selectPopup;
         hideSelectPopup();
         ASSERT(!m_selectPopup);
 
         // Don't trigger a disambiguation popup on sites designed for mobile devices.
         // Instead, assume that the page has been designed with big enough buttons and links.
         // Don't trigger a disambiguation popup when screencasting, since it's implemented outside of
         // compositor pipeline and is not being screencasted itself. This leads to bad user experience.
         if (event.data.tap.width > 0 && !shouldDisableDesktopWorkarounds() && !page()->inspectorController().screencastEnabled()) {
             WebGestureEvent scaledEvent = event;
@@ skipping 2499 matching lines @@
         if (TextAutosizer* textAutosizer = frame->document()->textAutosizer())
             textAutosizer->updatePageInfoInAllFrames();
     }
 }
 
 void WebViewImpl::updateMainFrameLayoutSize()
 {
     if (m_shouldAutoResize || !mainFrameImpl())
         return;
 
-    RefPtr<FrameView> view = mainFrameImpl()->frameView();
+    RefPtrWillBeRawPtr<FrameView> view = mainFrameImpl()->frameView();
     if (!view)
         return;
 
     WebSize layoutSize = m_size;
 
     if (settings()->viewportEnabled())
         layoutSize = flooredIntSize(m_pageScaleConstraintsSet.pageDefinedConstraints().layoutSize);
 
     if (page()->settings().forceZeroLayoutHeight())
         layoutSize.height = 0;
@@ skipping 1140 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink