Ensure that the page id assignment IPC is sent.

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 "base/auto_reset.h"
@@ skipping 2269 matching lines @@
       // If the history list is valid, our list of page IDs should be correct.
       DCHECK(render_view_->history_list_length_ <= 0 ||
              render_view_->history_list_offset_ < 0 ||
              render_view_->history_list_offset_ >=
                  render_view_->history_list_length_ ||
              render_view_->history_page_ids_[render_view_->history_list_offset_]
                   == render_view_->page_id_);
     }
   }
 
-  Send(new FrameHostMsg_DidAssignPageId(routing_id_, render_view_->page_id_));
+  bool sent = Send(
+      new FrameHostMsg_DidAssignPageId(routing_id_, render_view_->page_id_));
+  CHECK(sent);  // http://crbug.com/407376
 
   FOR_EACH_OBSERVER(RenderViewObserver, render_view_->observers_,
                     DidCommitProvisionalLoad(frame, is_new_navigation));
   FOR_EACH_OBSERVER(RenderFrameObserver, observers_,
                     DidCommitProvisionalLoad(is_new_navigation));
 
   if (!frame->parent()) {  // Only for top frames.
     RenderThreadImpl* render_thread_impl = RenderThreadImpl::current();
     if (render_thread_impl) {  // Can be NULL in tests.
       render_thread_impl->histogram_customizer()->
@@ skipping 1767 matching lines @@
 
 #if defined(ENABLE_BROWSER_CDMS)
 RendererCdmManager* RenderFrameImpl::GetCdmManager() {
   if (!cdm_manager_)
     cdm_manager_ = new RendererCdmManager(this);
   return cdm_manager_;
 }
 #endif  // defined(ENABLE_BROWSER_CDMS)
 
 }  // namespace content