Revert of Remove DCHECK_IMPLIES/CHECK_IMPLIES.

content/browser/frame_host/render_frame_proxy_host.cc

 // Copyright 2014 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/browser/frame_host/render_frame_proxy_host.h"
 
 #include "base/lazy_instance.h"
 #include "content/browser/bad_message.h"
 #include "content/browser/frame_host/cross_process_frame_connector.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 39 matching lines @@
       site_instance_(site_instance),
       process_(site_instance->GetProcess()),
       frame_tree_node_(frame_tree_node),
       render_frame_proxy_created_(false),
       render_view_host_(render_view_host) {
   GetProcess()->AddRoute(routing_id_, this);
   CHECK(g_routing_id_frame_proxy_map.Get().insert(
       std::make_pair(
           RenderFrameProxyHostID(GetProcess()->GetID(), routing_id_),
           this)).second);
-  CHECK(render_view_host ||
-        (frame_tree_node_->render_manager()->ForInnerDelegate() &&
-         frame_tree_node_->IsMainFrame()));
+  CHECK_IMPLIES(!render_view_host,
+                frame_tree_node_->render_manager()->ForInnerDelegate() &&
+                    frame_tree_node_->IsMainFrame());
   if (render_view_host)
     frame_tree_node_->frame_tree()->AddRenderViewHostRef(render_view_host_);
 
   bool is_proxy_to_parent = !frame_tree_node_->IsMainFrame() &&
                             frame_tree_node_->parent()
                                     ->render_manager()
                                     ->current_frame_host()
                                     ->GetSiteInstance() == site_instance;
   bool is_proxy_to_outer_delegate =
       frame_tree_node_->IsMainFrame() &&
@@ skipping 242 matching lines @@
         new FrameMsg_PostMessageEvent(target_rfh->GetRoutingID(), new_params));
   }
 }
 
 void RenderFrameProxyHost::OnDidChangeOpener(int32 opener_routing_id) {
   frame_tree_node_->render_manager()->DidChangeOpener(opener_routing_id,
                                                       GetSiteInstance());
 }
 
 }  // namespace content