Fixing gcc 4.7 building problems.

chrome/browser/extensions/settings/settings_frontend.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 "chrome/browser/extensions/settings/settings_frontend.h"
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/string_number_conversions.h"
 #include "chrome/browser/extensions/extension_event_names.h"
@@ skipping 81 matching lines @@
   SettingsStorageQuotaEnforcer::Limits limits = {
     api::storage::local::QUOTA_BYTES,
     UINT_MAX,
     UINT_MAX
   };
   return limits;
 }
 
 SettingsStorageQuotaEnforcer::Limits GetSyncLimits() {
   SettingsStorageQuotaEnforcer::Limits limits = {
-    api::storage::sync::QUOTA_BYTES,
-    api::storage::sync::QUOTA_BYTES_PER_ITEM,
-    api::storage::sync::MAX_ITEMS
+    static_cast<size_t>(api::storage::sync::QUOTA_BYTES),
+    static_cast<size_t>(api::storage::sync::QUOTA_BYTES_PER_ITEM),
+    static_cast<size_t>(api::storage::sync::MAX_ITEMS)
   };
   return limits;
 }
 
 }  // namespace
 
 // Ref-counted container for a SettingsBackend object.
 class SettingsFrontend::BackendWrapper
     : public base::RefCountedThreadSafe<BackendWrapper> {
  public:
@@ skipping 220 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return observers_;
 }
 
 // BackendWrappers
 
 SettingsFrontend::BackendWrappers::BackendWrappers() {}
 SettingsFrontend::BackendWrappers::~BackendWrappers() {}
 
 }  // namespace extensions