base: Remove the string logging from CHECK().

content/browser/frame_host/render_frame_host_manager.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/browser/frame_host/render_frame_host_manager.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <string>
@@ skipping 1041 matching lines @@
   RenderFrameProxyHost* proxy = GetRenderFrameProxyHost(site_instance);
   CHECK(proxy);
 
   DeleteRenderFrameProxyHost(site_instance);
 }
 
 RenderFrameProxyHost* RenderFrameHostManager::CreateRenderFrameProxyHost(
     SiteInstance* site_instance,
     RenderViewHostImpl* rvh) {
   int site_instance_id = site_instance->GetId();
-  CHECK(proxy_hosts_.find(site_instance_id) == proxy_hosts_.end())
-      << "A proxy already existed for this SiteInstance.";
+  // A proxy already existed for this SiteInstance.
+  CHECK(proxy_hosts_.find(site_instance_id) == proxy_hosts_.end());
   RenderFrameProxyHost* proxy_host =
       new RenderFrameProxyHost(site_instance, rvh, frame_tree_node_);
   proxy_hosts_[site_instance_id] = base::WrapUnique(proxy_host);
   static_cast<SiteInstanceImpl*>(site_instance)->AddObserver(this);
   return proxy_host;
 }
 
 void RenderFrameHostManager::DeleteRenderFrameProxyHost(
     SiteInstance* site_instance) {
   static_cast<SiteInstanceImpl*>(site_instance)->RemoveObserver(this);
@@ skipping 1662 matching lines @@
                                              resolved_url)) {
     DCHECK(!dest_instance ||
            dest_instance == render_frame_host_->GetSiteInstance());
     return false;
   }
 
   return true;
 }
 
 }  // namespace content