Makes GetComponentExtensionResourceManager() thread-safe.

extensions/shell/browser/shell_extensions_browser_client.h

 // 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.
 
 #ifndef EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSIONS_BROWSER_CLIENT_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include "base/compiler_specific.h"
 #include "extensions/browser/extensions_browser_client.h"
 
@@ skipping 53 matching lines @@
   void PermitExternalProtocolHandler() override;
   scoped_ptr<AppSorting> CreateAppSorting() override;
   bool IsRunningInForcedAppMode() override;
   ApiActivityMonitor* GetApiActivityMonitor(
       content::BrowserContext* context) override;
   ExtensionSystemProvider* GetExtensionSystemFactory() override;
   void RegisterExtensionFunctions(
       ExtensionFunctionRegistry* registry) const override;
   scoped_ptr<RuntimeAPIDelegate> CreateRuntimeAPIDelegate(
       content::BrowserContext* context) const override;
-  ComponentExtensionResourceManager* GetComponentExtensionResourceManager()
-      override;
+  const ComponentExtensionResourceManager*
+  GetComponentExtensionResourceManager() override;

[Yoyo Zhou, 2015/01/06 00:50:46]

nit: this looks odd, is it clang-formatted correctly?

[Jun Mukai, 2015/01/06 01:16:50]

This is the output of clang-format actually.
with "const", GetComponentExtensionResourceManager() can't fit into the previous
line.

   void BroadcastEventToRenderers(const std::string& event_name,
                                  scoped_ptr<base::ListValue> args) override;
   net::NetLog* GetNetLog() override;
   ExtensionCache* GetExtensionCache() override;
   bool IsBackgroundUpdateAllowed() override;
   bool IsMinBrowserVersionSupported(const std::string& min_version) override;
 
   // Sets the API client.
   void SetAPIClientForTest(ExtensionsAPIClient* api_client);
 
  private:
   // The single BrowserContext for app_shell. Not owned.
   content::BrowserContext* browser_context_;
 
   // The PrefService for |browser_context_|. Not owned.
   PrefService* pref_service_;
 
   // Support for extension APIs.
   scoped_ptr<ExtensionsAPIClient> api_client_;
 
   // The extension cache used for download and installation.
   scoped_ptr<ExtensionCache> extension_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellExtensionsBrowserClient);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_EXTENSIONS_BROWSER_CLIENT_H_