Mojo-ify implementation of screen orientation locking/unlocking.

content/renderer/render_frame_impl.cc

 // Copyright 2013 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 "content/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 1170 matching lines @@
     // Ensure the RenderView doesn't point to this object, once it is destroyed.
     // TODO(nasko): Add a check that the |main_render_frame_| of |render_view_|
     // is |this|, once the object is no longer leaked.
     // See https://crbug.com/464764.
     render_view_->main_render_frame_ = nullptr;
   }
 
   render_view_->UnregisterRenderFrame(this);
   g_routing_id_frame_map.Get().erase(routing_id_);
   RenderThread::Get()->RemoveRoute(routing_id_);
+
+  if (screen_orientation_dispatcher_) {

[blundell, 2016/10/25 16:09:27]

why this added code?

[lunalu1, 2016/11/03 23:15:25]

Done.

+    delete screen_orientation_dispatcher_;
+    screen_orientation_dispatcher_ = nullptr;
+  }
 }
 
 void RenderFrameImpl::BindToWebFrame(blink::WebLocalFrame* web_frame) {
   DCHECK(!frame_);
 
   std::pair<FrameMap::iterator, bool> result = g_frame_map.Get().insert(
       std::make_pair(web_frame, this));
   CHECK(result.second) << "Inserting a duplicate item.";
 
   frame_ = web_frame;
@@ skipping 5368 matching lines @@
   // event target. Potentially a Pepper plugin will receive the event.
   // In order to tell whether a plugin gets the last mouse event and which it
   // is, we set |pepper_last_mouse_event_target_| to null here. If a plugin gets
   // the event, it will notify us via DidReceiveMouseEvent() and set itself as
   // |pepper_last_mouse_event_target_|.
   pepper_last_mouse_event_target_ = nullptr;
 #endif
 }
 
 }  // namespace content