Make MockExtensionSystemFactory available in all ExtensionsTests.

extensions/browser/extensions_test.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_BROWSER_EXTENSIONS_TEST_H_
 #define EXTENSIONS_BROWSER_EXTENSIONS_TEST_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/public/test/test_renderer_host.h"
+#include "extensions/browser/mock_extension_system.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 class BrowserContext;
 class ContentBrowserClient;
 class ContentClient;
 class ContentUtilityClient;
 class RenderViewHostTestEnabler;
 }
 
@@ skipping 32 matching lines @@
   scoped_ptr<content::ContentClient> content_client_;
   scoped_ptr<content::ContentUtilityClient> content_utility_client_;
   scoped_ptr<content::ContentBrowserClient> content_browser_client_;
   scoped_ptr<content::BrowserContext> browser_context_;
   scoped_ptr<TestExtensionsBrowserClient> extensions_browser_client_;
 
   // The existence of this object enables tests via
   // RenderViewHostTester.
   content::RenderViewHostTestEnabler rvh_test_enabler_;
 
+  MockExtensionSystemFactory<MockExtensionSystem> extension_system_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionsTest);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSIONS_TEST_H_