Getting rid of more webview memory leaks.

components/guest_view/browser/guest_view_base.h

Index: components/guest_view/browser/guest_view_base.h
diff --git a/components/guest_view/browser/guest_view_base.h b/components/guest_view/browser/guest_view_base.h
index 2f167e15679a54ef9769281843beddf1204b646a..cba69a12399ee79a353ba532f495b2a49d5afef9 100644
--- a/components/guest_view/browser/guest_view_base.h
+++ b/components/guest_view/browser/guest_view_base.h
@@ -60,6 +60,13 @@ class GuestViewBase : public content::BrowserPluginGuestDelegate,
     return nullptr;
   }
 
+  // Cleans up state when this GuestView is being destroyed.
+  // Note that this cannot be done in the destructor since a GuestView could
+  // potentially be created and destroyed in JavaScript before getting a
+  // GuestViewBase instance. This method can be hidden by a CleanUp() method in
+  // a derived class, in which case the derived method should call this one.
+  static void CleanUp(int embedder_process_id, int view_instance_id);
+
   static GuestViewBase* FromWebContents(
       const content::WebContents* web_contents);
 
@@ -92,12 +99,6 @@ class GuestViewBase : public content::BrowserPluginGuestDelegate,
   // completed loading.
   virtual void GuestViewDidStopLoading() {}
 
-  // This method is called before the embedder is destroyed.
-  // |owner_web_contents_| should still be valid during this call. This
-  // allows the derived class to perform some cleanup related to the embedder
-  // web contents.
-  virtual void EmbedderWillBeDestroyed() {}
-
   // This method is called when the embedder's zoom changes.
   virtual void EmbedderZoomChanged(double old_zoom_level,
                                    double new_zoom_level) {}