clang/win: Let remaining chromium_code targets build with -Wextra.

rlz/win/lib/rlz_value_store_registry.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 "rlz/win/lib/rlz_value_store_registry.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/registry.h"
 #include "rlz/lib/assert.h"
@@ skipping 331 matching lines @@
 
 void RlzValueStoreRegistry::CollectGarbage() {
   // Delete each of the known subkeys if empty.
   const char* const subkeys[] = {
     kRlzsSubkeyName,
     kEventsSubkeyName,
     kStatefulEventsSubkeyName,
     kPingTimesSubkeyName
   };
 
-  for (int i = 0; i < arraysize(subkeys); i++) {
+  for (size_t i = 0; i < arraysize(subkeys); i++) {
     std::string subkey_name;
     base::StringAppendF(&subkey_name, "%s\\%s", kLibKeyName, subkeys[i]);
     AppendBrandToString(&subkey_name);
     base::string16 subkey_name16 = ASCIIToUTF16(subkey_name);
 
     VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, subkey_name16.c_str()));
   }
 
   // Delete the library key and its parents too now if empty.
   VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, GetWideLibKeyName().c_str()));
   VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, kGoogleCommonKeyName));
   VERIFY(DeleteKeyIfEmpty(HKEY_CURRENT_USER, kGoogleKeyName));
 }
 
 ScopedRlzValueStoreLock::ScopedRlzValueStoreLock() {
   if (!lock_.failed())
     store_.reset(new RlzValueStoreRegistry);
 }
 
 ScopedRlzValueStoreLock::~ScopedRlzValueStoreLock() {
 }
 
 RlzValueStore* ScopedRlzValueStoreLock::GetStore() {
   return store_.get();
 }
 
 }  // namespace rlz_lib