Revert of Deletes mojo::Callback

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 <stddef.h>
 #include <stdint.h>
 
@@ skipping 653 matching lines @@
   bool is_threaded_animation_enabled_;
 
   class PendingFrameCreate : public base::RefCounted<PendingFrameCreate> {
    public:
      PendingFrameCreate(int routing_id,
                         mojom::FrameRequest frame_request,
                         mojom::FrameHostPtr frame_host);
 
     mojom::FrameRequest TakeFrameRequest() { return std::move(frame_request_); }
     mojom::FrameHostPtr TakeFrameHost() {
-      frame_host_.set_connection_error_handler(base::Closure());
+      frame_host_.set_connection_error_handler(mojo::Closure());
       return std::move(frame_host_);
     }
 
    private:
     friend class base::RefCounted<PendingFrameCreate>;
 
     ~PendingFrameCreate();
 
     // Mojo error handler.
     void OnConnectionError();
@@ skipping 14 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(RenderThreadImpl);
 };
 
 #if defined(COMPILER_MSVC)
 #pragma warning(pop)
 #endif
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_THREAD_IMPL_H_