Move Extension into extensions namespace

chrome/browser/extensions/extension_apitest.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_APITEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_APITEST_H_
 #pragma once
 
 #include <deque>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "content/public/browser/notification_registrar.h"
 
+class FilePath;
+
+namespace extensions {
+class Extension;
+}
+
 namespace ui_test_utils {
 class TestWebSocketServer;
 }
 
-class Extension;
-class FilePath;
-
 // The general flow of these API tests should work like this:
 // (1) Setup initial browser state (e.g. create some bookmarks for the
 //     bookmark test)
 // (2) Call ASSERT_TRUE(RunExtensionTest(name));
 // (3) In your extension code, run your test and call chrome.test.pass or
 //     chrome.test.fail
 // (4) Verify expected browser state.
 // TODO(erikkay): There should also be a way to drive events in these tests.
 
 class ExtensionApiTest : public ExtensionBrowserTest {
@@ skipping 107 matching lines @@
   // will be available to javascript tests using chrome.test.getConfig().
   bool StartTestServer();
 
   // Start the test WebSocket server, and store details of its state. Those
   // details will be available to javascript tests using
   // chrome.test.getConfig().
   bool StartWebSocketServer(const FilePath& root_directory);
 
   // Test that exactly one extension loaded.  If so, return a pointer to
   // the extension.  If not, return NULL and set message_.
-  const Extension* GetSingleLoadedExtension();
+  const extensions::Extension* GetSingleLoadedExtension();
 
   // All extensions tested by ExtensionApiTest are in the "api_test" dir.
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE;
 
   // If it failed, what was the error message?
   std::string message_;
 
  private:
   bool RunExtensionTestImpl(const char* extension_name,
                             const std::string& test_page,
@@ skipping 11 matching lines @@
 // apps (if any).
 class PlatformAppApiTest : public ExtensionApiTest {
  public:
   PlatformAppApiTest();
   virtual ~PlatformAppApiTest();
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_APITEST_H_