Remove //chrome dependency from ExtensionPrefs

extensions/browser/extensions_browser_client.h

 // Copyright 2013 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_BROWSER_CLIENT_H_
 #define EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 10 matching lines @@
 class BrowserContext;
 class WebContents;
 }
 
 namespace extensions {
 
 class ApiActivityMonitor;
 class AppSorting;
 class Extension;
 class ExtensionHostDelegate;
+class ExtensionPrefs;
 class ExtensionSystem;
 class ExtensionSystemProvider;
 
 // Interface to allow the extensions module to make browser-process-specific
 // queries of the embedder. Should be Set() once in the browser process.
 //
 // NOTE: Methods that do not require knowledge of browser concepts should be
 // added in ExtensionsClient (extensions/common/extensions_client.h) even if
 // they are only used in the browser process.
 class ExtensionsBrowserClient {
@@ skipping 81 matching lines @@
       content::BrowserContext* context) = 0;
 
   // Returns the factory that provides an ExtensionSystem to be returned from
   // ExtensionSystem::Get.
   virtual ExtensionSystemProvider* GetExtensionSystemFactory() = 0;
 
   // Registers extension functions not belonging to the core extensions APIs.
   virtual void RegisterExtensionFunctions(
       ExtensionFunctionRegistry* registry) const = 0;
 
+  // Registers client observers on each per-context ExtensionPrefs instance.
+  virtual void AddExtensionPrefsObservers(content::BrowserContext* context,
+                                          ExtensionPrefs* prefs) const = 0;
+
   // Returns the single instance of |this|.
   static ExtensionsBrowserClient* Get();
 
   // Initialize the single instance.
   static void Set(ExtensionsBrowserClient* client);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_