Remove null Document check from RenderFrameImpl::OnMessageReceived

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 1459 matching lines @@
       return render_view()->OnMessageReceived(msg);
 
     return false;
   }
 
   // We may get here while detaching, when the WebFrame has been deleted.  Do
   // not process any messages in this state.
   if (!frame_)
     return false;
 
-  // TODO(kenrb): document() should not be null, but as a transitional step
-  // we have RenderFrameProxy 'wrapping' a RenderFrameImpl, passing messages
-  // to this method. This happens for a top-level remote frame, where a
-  // document-less RenderFrame is replaced by a RenderFrameProxy but kept
-  // around and is still able to receive messages.
-  if (!frame_->document().isNull())
-    GetContentClient()->SetActiveURL(frame_->document().url());
+  DCHECK(!frame_->document().isNull());
+
+  GetContentClient()->SetActiveURL(frame_->document().url());
 
   for (auto& observer : observers_) {
     if (observer.OnMessageReceived(msg))
       return true;
   }
 
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RenderFrameImpl, msg)
     IPC_MESSAGE_HANDLER(FrameMsg_Navigate, OnNavigate)
     IPC_MESSAGE_HANDLER(FrameMsg_BeforeUnload, OnBeforeUnload)
@@ skipping 5174 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