Add a missing header for official build to fix compile error.

chrome/browser/extensions/component_loader.cc

 // Copyright (c) 2011 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/component_loader.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "base/json/json_value_serializer.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/pref_names.h"
 #include "grit/browser_resources.h"
 #include "ui/base/resource/resource_bundle.h"
 
+#if defined(OFFICIAL_BUILD)
+#include "chrome/browser/defaults.h"
+#endif
+
 namespace {
 
 typedef std::list<std::pair<FilePath::StringType, int> >
     ComponentExtensionList;
 
 #if defined(FILE_MANAGER_EXTENSION)
 void AddFileManagerExtension(ComponentExtensionList* component_extensions) {
 #ifndef NDEBUG
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kFileManagerExtensionPath)) {
@@ skipping 186 matching lines @@
         .AppendASCII(extension_misc::kChromeVoxDirectoryName);
     std::string manifest =
         ResourceBundle::GetSharedInstance().GetRawDataResource(
             IDR_CHROMEVOX_MANIFEST).as_string();
     Add(manifest, path);
   }
 #endif
 }
 
 }  // namespace extensions