Oilpan: move WebPluginLoadObserver to the heap.

third_party/WebKit/Source/web/WebDataSourceImpl.h

Index: third_party/WebKit/Source/web/WebDataSourceImpl.h
diff --git a/third_party/WebKit/Source/web/WebDataSourceImpl.h b/third_party/WebKit/Source/web/WebDataSourceImpl.h
index 1c960aad54cf5a46dcea65fd7944aef9a1efd852..77e858093593a72f27dcd5770ecbb5a1f85cffec 100644
--- a/third_party/WebKit/Source/web/WebDataSourceImpl.h
+++ b/third_party/WebKit/Source/web/WebDataSourceImpl.h
@@ -44,8 +44,6 @@
 
 namespace blink {
 
-class WebPluginLoadObserver;
-
 class WebDataSourceImpl final : public DocumentLoader, public WebDataSource {
 public:
     static PassRefPtrWillBeRawPtr<WebDataSourceImpl> create(LocalFrame*, const ResourceRequest&, const SubstituteData&);
@@ -72,8 +70,8 @@ public:
 
     static WebNavigationType toWebNavigationType(NavigationType);
 
-    PassOwnPtr<WebPluginLoadObserver> releasePluginLoadObserver() { return m_pluginLoadObserver.release(); }
-    static void setNextPluginLoadObserver(PassOwnPtr<WebPluginLoadObserver>);
+    PassOwnPtrWillBeRawPtr<WebPluginLoadObserver> releasePluginLoadObserver() { return m_pluginLoadObserver.release(); }
+    static void setNextPluginLoadObserver(PassOwnPtrWillBeRawPtr<WebPluginLoadObserver>);
 
     DECLARE_VIRTUAL_TRACE();
 
@@ -90,7 +88,7 @@ private:
     mutable WrappedResourceResponse m_responseWrapper;
 
     OwnPtr<ExtraData> m_extraData;
-    OwnPtr<WebPluginLoadObserver> m_pluginLoadObserver;
+    OwnPtrWillBeMember<WebPluginLoadObserver> m_pluginLoadObserver;
 };
 
 } // namespace blink