Move small c/b/extensions classes into extensions namespace no.2

chrome/browser/extensions/api/media_galleries/media_galleries_apitest.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 "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/platform_app_browsertest_util.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 
 #if defined(OS_LINUX)
 #include <fstream>
 
 #include "base/environment.h"
 #include "base/scoped_temp_dir.h"
 #endif
 
 namespace {
 
-class ExperimentalMediaGalleriesAppBrowserTest : public PlatformAppBrowserTest {
+class ExperimentalMediaGalleriesAppBrowserTest
+    : public extensions::PlatformAppBrowserTest {
  public:
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
-    PlatformAppBrowserTest::SetUpCommandLine(command_line);
+    extensions::PlatformAppBrowserTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kEnableExperimentalExtensionApis);
   }
 };
 
 class ExperimentalMediaGalleriesApiTest : public ExtensionApiTest {
  public:
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
     ExtensionApiTest::SetUpCommandLine(command_line);
     command_line->AppendSwitch(switches::kEnableExperimentalExtensionApis);
   }
@@ skipping 54 matching lines @@
                        MediaGalleriesNoAccess) {
   EnsurePictureDirectoryExists picture_directory;
   ASSERT_TRUE(RunPlatformAppTest("api_test/media_galleries/no_access"))
       << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExperimentalMediaGalleriesApiTest,
                        ExperimentalMediaGalleries) {
   ASSERT_TRUE(RunExtensionTest("media_galleries/experimental")) << message_;
 }