base: Remove the string logging from CHECK().

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 6141da6dc17a327adfaad69e89de263e97aec73e..a8399b2ad85bcda09a398d091233bc47ef3e2d7d 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -301,7 +301,8 @@ RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
   std::pair<RoutingIDWidgetMap::iterator, bool> result =
       g_routing_id_widget_map.Get().insert(std::make_pair(
           RenderWidgetHostID(process->GetID(), routing_id_), this));
-  CHECK(result.second) << "Inserting a duplicate item!";
+  // Inserting a duplicate item!
+  CHECK(result.second);
   process_->AddRoute(routing_id_, this);
 
   // If we're initially visible, tell the process host that we're alive.