Reduce the public method footprint of GuestViewBase and derived types.

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h

Index: extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
diff --git a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
index 26c0e118f04b26d97dc9e71ed73c1e5fe78f63e2..d48243052e15e17d018642d390ff617c11824e79 100644
--- a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
+++ b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.h
@@ -57,38 +57,40 @@ class MimeHandlerViewGuest :
 
   static const char Type[];
 
+ protected:
+  explicit MimeHandlerViewGuest(content::WebContents* owner_web_contents);
+  ~MimeHandlerViewGuest() override;
+
+ private:
+  friend class TestMimeHandlerViewGuest;
+
   // GuestViewBase implementation.
-  const char* GetAPINamespace() const override;
-  int GetTaskPrefix() const override;
+  const char* GetAPINamespace() const final;
+  int GetTaskPrefix() const final;
   void CreateWebContents(const base::DictionaryValue& create_params,
                          const WebContentsCreatedCallback& callback) override;
   void DidAttachToEmbedder() override;
-  void DidInitialize(const base::DictionaryValue& create_params) override;
-  bool ShouldHandleFindRequestsForEmbedder() const override;
-  bool ZoomPropagatesFromEmbedderToGuest() const override;
+  void DidInitialize(const base::DictionaryValue& create_params) final;
+  bool ShouldHandleFindRequestsForEmbedder() const final;
+  bool ZoomPropagatesFromEmbedderToGuest() const final;
 
   // WebContentsDelegate implementation.
   content::WebContents* OpenURLFromTab(
       content::WebContents* source,
-      const content::OpenURLParams& params) override;
-  bool HandleContextMenu(const content::ContextMenuParams& params) override;
+      const content::OpenURLParams& params) final;
+  bool HandleContextMenu(const content::ContextMenuParams& params) final;
   bool PreHandleGestureEvent(content::WebContents* source,
-                             const blink::WebGestureEvent& event) override;
+                             const blink::WebGestureEvent& event) final;
   content::JavaScriptDialogManager* GetJavaScriptDialogManager(
-      content::WebContents* source) override;
-  bool SaveFrame(const GURL& url, const content::Referrer& referrer) override;
+      content::WebContents* source) final;
+  bool SaveFrame(const GURL& url, const content::Referrer& referrer) final;
 
   // content::WebContentsObserver implementation.
-  void DocumentOnLoadCompletedInMainFrame() override;
+  void DocumentOnLoadCompletedInMainFrame() final;
 
   std::string view_id() const { return view_id_; }
   base::WeakPtr<StreamContainer> GetStream() const;
 
- protected:
-  explicit MimeHandlerViewGuest(content::WebContents* owner_web_contents);
-  ~MimeHandlerViewGuest() override;
-
- private:
   scoped_ptr<MimeHandlerViewGuestDelegate> delegate_;
   scoped_ptr<StreamContainer> stream_;
   std::string view_id_;