Remove all the browser side extensions code from Android.

chrome/test/base/testing_browser_process.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.
 
 // An implementation of BrowserProcess for unit tests that fails for most
 // services. By preventing creation of services, we reduce dependencies and
 // keep the profile clean. Clients of this class must handle the NULL return
 // value, however.
 
 #ifndef CHROME_TEST_BASE_TESTING_BROWSER_PROCESS_H_
@@ skipping 148 matching lines @@
   scoped_ptr<printing::PrintJobManager> print_job_manager_;
   scoped_ptr<printing::BackgroundPrintingManager> background_printing_manager_;
   scoped_refptr<printing::PrintPreviewDialogController>
       print_preview_dialog_controller_;
 #endif
 
   scoped_ptr<prerender::PrerenderTracker> prerender_tracker_;
   scoped_refptr<SafeBrowsingService> sb_service_;
 #endif  // !defined(OS_IOS)
 
-#if !defined(OS_IOS) && !defined(OS_ANDROID)
-  scoped_ptr<MediaFileSystemRegistry> media_file_system_registry_;
-#endif
-
   scoped_ptr<network_time::NetworkTimeTracker> network_time_tracker_;
 
   // The following objects are not owned by TestingBrowserProcess:
   PrefService* local_state_;
   IOThread* io_thread_;
   net::URLRequestContextGetter* system_request_context_;
 
   scoped_ptr<BrowserProcessPlatformPart> platform_part_;
 
+#if defined(ENABLE_EXTENSIONS)
+  scoped_ptr<MediaFileSystemRegistry> media_file_system_registry_;
+
   scoped_ptr<extensions::ExtensionsBrowserClient> extensions_browser_client_;
+#endif
 
   DISALLOW_COPY_AND_ASSIGN(TestingBrowserProcess);
 };
 
 // RAII (resource acquisition is initialization) for TestingBrowserProcess.
 // Allows you to initialize TestingBrowserProcess/NotificationService before
 // other member variables.
 //
 // This can be helpful if you are running a unit test inside the browser_tests
 // suite because browser_tests do not make a TestingBrowserProcess for you.
 //
 // class MyUnitTestRunningAsBrowserTest : public testing::Test {
 //  ...stuff...
 //  private:
 //   TestingBrowserProcessInitializer initializer_;
 //   LocalState local_state_;  // Needs a BrowserProcess to initialize.
 //   NotificationRegistrar registar_;  // Needs NotificationService.
 // };
 class TestingBrowserProcessInitializer {
  public:
   TestingBrowserProcessInitializer();
   ~TestingBrowserProcessInitializer();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestingBrowserProcessInitializer);
 };
 
 #endif  // CHROME_TEST_BASE_TESTING_BROWSER_PROCESS_H_