Remove the MessageLoop::DestructionObserver from mojo bindings.

chrome/browser/media/router/presentation_service_delegate_observers.cc

 // Copyright 2016 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.
+
 #include "chrome/browser/media/router/presentation_service_delegate_observers.h"
 
+#include "base/stl_util.h"
+
 namespace media_router {
 
 PresentationServiceDelegateObservers::PresentationServiceDelegateObservers() {}
 
 PresentationServiceDelegateObservers::~PresentationServiceDelegateObservers() {
   for (auto& observer_pair : observers_)
     observer_pair.second->OnDelegateDestroyed();
 }
 
 void PresentationServiceDelegateObservers::AddObserver(
     int render_process_id,
     int render_frame_id,
     content::PresentationServiceDelegate::Observer* observer) {
   DCHECK(observer);
 
   RenderFrameHostId rfh_id(render_process_id, render_frame_id);
   DCHECK(!base::ContainsKey(observers_, rfh_id));
   observers_[rfh_id] = observer;
 }
 
 void PresentationServiceDelegateObservers::RemoveObserver(int render_process_id,
                                                           int render_frame_id) {
   observers_.erase(RenderFrameHostId(render_process_id, render_frame_id));
 }
 
 }  // namespace media_router