Move ExtensionHost into extensions namespace

chrome/browser/extensions/extension_service.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_
 
 #include <list>
 #include <map>
 #include <set>
@@ skipping 509 matching lines @@
   // This method is public because UnpackedInstaller and InstalledLoader
   // can post to here.
   // TODO(aa): Remove this. It doesn't do enough to be worth the dependency
   // of these classes on ExtensionService.
   void ReportExtensionLoadError(const FilePath& extension_path,
                                 const std::string& error,
                                 bool be_noisy);
 
   // ExtensionHost of background page calls this method right after its render
   // view has been created.
-  void DidCreateRenderViewForBackgroundPage(ExtensionHost* host);
+  void DidCreateRenderViewForBackgroundPage(extensions::ExtensionHost* host);
 
   // For the extension in |version_path| with |id|, check to see if it's an
   // externally managed extension.  If so, uninstall it.
   void CheckExternalUninstall(const std::string& id);
 
   // Clear all ExternalProviders.
   void ClearProvidersForTesting();
 
   // Adds an ExternalProviderInterface for the service to use during testing.
   // Takes ownership of |test_provider|.
@@ skipping 313 matching lines @@
   scoped_ptr<ExtensionErrorUI> extension_error_ui_;
 
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsWithUnlimtedStorage);
   FRIEND_TEST_ALL_PREFIXES(ExtensionServiceTest,
                            InstallAppsAndCheckStorageProtection);
   DISALLOW_COPY_AND_ASSIGN(ExtensionService);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_SERVICE_H_