Remove //chrome dependency from ExtensionPrefs

extensions/browser/test_extensions_browser_client.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_TEST_EXTENSIONS_BROWSER_CLIENT_H_
 #define EXTENSIONS_BROWSER_TEST_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include "base/compiler_specific.h"
 #include "extensions/browser/extensions_browser_client.h"
 
@@ skipping 41 matching lines @@
       OVERRIDE;
   virtual bool DidVersionUpdate(content::BrowserContext* context) OVERRIDE;
   virtual void PermitExternalProtocolHandler() OVERRIDE;
   virtual scoped_ptr<AppSorting> CreateAppSorting() OVERRIDE;
   virtual bool IsRunningInForcedAppMode() OVERRIDE;
   virtual ApiActivityMonitor* GetApiActivityMonitor(
       content::BrowserContext* context) OVERRIDE;
   virtual ExtensionSystemProvider* GetExtensionSystemFactory() OVERRIDE;
   virtual void RegisterExtensionFunctions(
       ExtensionFunctionRegistry* registry) const OVERRIDE;
+  virtual void AddExtensionPrefsObservers(content::BrowserContext* context,
+                                          ExtensionPrefs* prefs) const OVERRIDE;
 
  private:
   content::BrowserContext* main_context_;       // Not owned.
   content::BrowserContext* incognito_context_;  // Not owned, defaults to NULL.
 
   DISALLOW_COPY_AND_ASSIGN(TestExtensionsBrowserClient);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_TEST_EXTENSIONS_BROWSER_CLIENT_H_