Fix a warning in 64bit c++11 mode.

webkit/plugins/ppapi/message_channel.cc

 // Copyright (c) 2012 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 "webkit/plugins/ppapi/message_channel.h"
 
 #include <cstdlib>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 266 matching lines @@
     return false;
 
   // Invoke on the passthrough object, if we have one, to enumerate its
   // properties.
   NPObject* passthrough = ToPassThroughObject(np_obj);
   if (passthrough) {
     bool success = WebBindings::enumerate(NULL, passthrough, value, count);
     if (success) {
       // Add postMessage to the list and return it.
       if (std::numeric_limits<size_t>::max() / sizeof(NPIdentifier) <=
-          (*count + 1))
+          static_cast<size_t>(*count + 1))  // Else, "always false" x64 warning.

[piman, 2013/04/18 23:11:36]

paranoid in me: static_cast<size_t>(*count) + 1 ?
That way we don't risk wrap before casting.

[Nico, 2013/04/18 23:13:52]

Done.

         return false;
       NPIdentifier* new_array = static_cast<NPIdentifier*>(
           std::malloc(sizeof(NPIdentifier) * (*count + 1)));
       std::memcpy(new_array, *value, sizeof(NPIdentifier)*(*count));
       new_array[*count] = WebBindings::getStringIdentifier(kPostMessage);
       std::free(*value);
       *value = new_array;
       ++(*count);
       return true;
     }
@@ skipping 190 matching lines @@
   // invokes:
   //   SetPassthroughObject(passthrough_object());
   if (passthrough_object_)
     WebBindings::releaseObject(passthrough_object_);
 
   passthrough_object_ = passthrough;
 }
 
 }  // namespace ppapi
 }  // namespace webkit