Convert mojo::ErrorHandler usages into callbacks.

content/renderer/render_thread_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 #define CONTENT_RENDERER_RENDER_THREAD_IMPL_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 593 matching lines @@
   int gpu_rasterization_msaa_sample_count_;
   bool is_lcd_text_enabled_;
   bool is_distance_field_text_enabled_;
   bool is_zero_copy_enabled_;
   bool is_one_copy_enabled_;
   bool is_elastic_overscroll_enabled_;
   unsigned use_image_texture_target_;
   bool is_gather_pixel_refs_enabled_;
 
   class PendingRenderFrameConnect
-      : public base::RefCounted<PendingRenderFrameConnect>,
-        public mojo::ErrorHandler {
+      : public base::RefCounted<PendingRenderFrameConnect> {
    public:
     PendingRenderFrameConnect(
         int routing_id,
         mojo::InterfaceRequest<mojo::ServiceProvider> services,
         mojo::ServiceProviderPtr exposed_services);
 
     mojo::InterfaceRequest<mojo::ServiceProvider>& services() {
       return services_;
     }
 
     mojo::ServiceProviderPtr& exposed_services() { return exposed_services_; }
 
    private:
     friend class base::RefCounted<PendingRenderFrameConnect>;
 
-    ~PendingRenderFrameConnect() override;
+    ~PendingRenderFrameConnect();
 
-    void OnConnectionError() override;
+    // Mojo error handler.
+    void OnConnectionError();
 
     int routing_id_;
     mojo::InterfaceRequest<mojo::ServiceProvider> services_;
     mojo::ServiceProviderPtr exposed_services_;
   };
 
   typedef std::map<int, scoped_refptr<PendingRenderFrameConnect>>
       PendingRenderFrameConnectMap;
   PendingRenderFrameConnectMap pending_render_frame_connects_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_