Move the Widget hierarchy to the Oilpan heap.

Source/web/FrameLoaderClientImpl.cpp

 /*
  * Copyright (C) 2009, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2011 Apple 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.
@@ skipping 643 matching lines @@
     params.loadManually = loadManually;
 
     OwnPtr<WebPluginPlaceholder> webPluginPlaceholder = adoptPtr(
         m_webFrame->client()->createPluginPlaceholder(m_webFrame, params));
     if (!webPluginPlaceholder)
         return nullptr;
 
     return PluginPlaceholderImpl::create(webPluginPlaceholder.release(), document);
 }
 
-PassRefPtr<Widget> FrameLoaderClientImpl::createPlugin(
+PassRefPtrWillBeRawPtr<Widget> FrameLoaderClientImpl::createPlugin(
     HTMLPlugInElement* element,
     const KURL& url,
     const Vector<String>& paramNames,
     const Vector<String>& paramValues,
     const String& mimeType,
     bool loadManually,
     DetachedPluginPolicy policy)
 {
     if (!m_webFrame->client())
         return nullptr;
 
     WebPluginParams params;
     params.url = url;
     params.mimeType = mimeType;
     params.attributeNames = paramNames;
     params.attributeValues = paramValues;
     params.loadManually = loadManually;
 
     WebPlugin* webPlugin = m_webFrame->client()->createPlugin(m_webFrame, params);
     if (!webPlugin)
         return nullptr;
 
     // The container takes ownership of the WebPlugin.
-    RefPtr<WebPluginContainerImpl> container =
+    RefPtrWillBeRawPtr<WebPluginContainerImpl> container =
         WebPluginContainerImpl::create(element, webPlugin);
 
-    if (!webPlugin->initialize(container.get()))
+    if (!webPlugin->initialize(container.get())) {
+#if ENABLE(OILPAN)
+        container->dispose();
+#endif
         return nullptr;
+    }
 
-    if (policy != AllowDetachedPlugin && !element->renderer())
+    if (policy != AllowDetachedPlugin && !element->renderer()) {
+#if ENABLE(OILPAN)
+        container->dispose();
+#endif
         return nullptr;
+    }
 
     return container;
 }
 
-PassRefPtr<Widget> FrameLoaderClientImpl::createJavaAppletWidget(
+PassRefPtrWillBeRawPtr<Widget> FrameLoaderClientImpl::createJavaAppletWidget(
     HTMLAppletElement* element,
     const KURL& /* baseURL */,
     const Vector<String>& paramNames,
     const Vector<String>& paramValues)
 {
     return createPlugin(element, KURL(), paramNames, paramValues,
         "application/x-java-applet", false, FailOnDetachedPlugin);
 }
 
 ObjectContentType FrameLoaderClientImpl::objectContentType(
@@ skipping 141 matching lines @@
         m_webFrame->client()->didAbortLoading(m_webFrame);
 }
 
 void FrameLoaderClientImpl::dispatchDidChangeManifest()
 {
     if (m_webFrame->client())
         m_webFrame->client()->didChangeManifest(m_webFrame);
 }
 
 } // namespace blink