Replace ToLower calls to the new format

chrome/browser/extensions/api/gcm/gcm_api.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 "chrome/browser/extensions/api/gcm/gcm_api.h"
 
 #include <algorithm>
 #include <map>
 #include <vector>
 
@@ skipping 49 matching lines @@
     default:
       NOTREACHED() << "Unexpected value of result cannot be converted: "
                    << result;
   }
 
   // Never reached, but prevents missing return statement warning.
   return "";
 }
 
 bool IsMessageKeyValid(const std::string& key) {
-  std::string lower = base::StringToLowerASCII(key);
+  std::string lower = base::ToLowerASCII(key);
   return !key.empty() &&
          key.compare(0, arraysize(kCollapseKey) - 1, kCollapseKey) != 0 &&
          lower.compare(0,
                        arraysize(kGoogleRestrictedPrefix) - 1,
                        kGoogleRestrictedPrefix) != 0 &&
          lower.compare(0,
                        arraysize(kGoogDotRestrictedPrefix),
                        kGoogDotRestrictedPrefix) != 0;
 }
 
@@ skipping 154 matching lines @@
   error.error_message = GcmResultToError(send_error_details.result);
   error.details.additional_properties = send_error_details.additional_data;
 
   scoped_ptr<Event> event(
       new Event(events::GCM_ON_SEND_ERROR, api::gcm::OnSendError::kEventName,
                 api::gcm::OnSendError::Create(error).Pass(), profile_));
   EventRouter::Get(profile_)->DispatchEventToExtension(app_id, event.Pass());
 }
 
 }  // namespace extensions