Fix the compile error for win64: widevine_key_systems.cc.

components/cdm/renderer/widevine_key_systems.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 "components/cdm/renderer/widevine_key_systems.h"
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "components/cdm/common/cdm_messages_android.h"
 #include "content/public/renderer/key_system_info.h"
 #include "content/public/renderer/render_thread.h"
 
 #include "widevine_cdm_version.h" // In SHARED_INTERMEDIATE_DIR.
 
 #if defined(WIDEVINE_CDM_AVAILABLE)
 
 using content::KeySystemInfo;
 using content::SupportedCodecs;
 
 namespace cdm {
 
 // Return |name|'s parent key system.
 static std::string GetDirectParentName(std::string name) {
-  int last_period = name.find_last_of('.');
+  size_t last_period = name.find_last_of('.');
   DCHECK_GT(last_period, 0);

[xhwang, 2014/05/09 23:59:22]

s/0/0u?

[ycheo (away), 2014/05/10 00:03:45]

Hmm. actually, size_t is unsigned.
Isn't it better to remove this?

   return name.substr(0, last_period);
 }
 
 void AddWidevineWithCodecs(WidevineCdmType widevine_cdm_type,
                            SupportedCodecs supported_codecs,
                            std::vector<KeySystemInfo>* concrete_key_systems) {
   KeySystemInfo info(kWidevineKeySystem);
 
   switch (widevine_cdm_type) {
     case WIDEVINE:
@@ skipping 46 matching lines @@
         WIDEVINE_HR_NON_COMPOSITING,
         static_cast<SupportedCodecs>(response.non_compositing_codecs),
         concrete_key_systems);
   }
 }
 #endif  // OS_ANDROID
 
 }  // namespace cdm
 
 #endif  // defined(WIDEVINE_CDM_AVAILABLE)