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>
 
 #include "base/memory/scoped_ptr.h"
+#include "extensions/browser/extension_prefs_observer.h"
 
 class ExtensionFunctionRegistry;
 class PrefService;
 
 namespace base {
 class CommandLine;
 }
 
 namespace content {
 class BrowserContext;
 class WebContents;
 }
 
 namespace extensions {
 
 class ApiActivityMonitor;
 class AppSorting;
 class Extension;
 class ExtensionHostDelegate;
+class ExtensionPrefsObserver;
 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 42 matching lines @@
   // Returns true if |extension| can see events and data from another
   // sub-profile (incognito to original profile, or vice versa).
   virtual bool CanExtensionCrossIncognito(
       const extensions::Extension* extension,
       content::BrowserContext* context) const = 0;
 
   // Returns the PrefService associated with |context|.
   virtual PrefService* GetPrefServiceForContext(
       content::BrowserContext* context) = 0;
 
+  // Populates a list of ExtensionPrefs observers to be attached to each
+  // BrowserContext's ExtensionPrefs upon construction. These observers
+  // are not owned by ExtensionPrefs.
+  virtual void GetAdditionalExtensionPrefsObservers(
+      content::BrowserContext* context,
+      std::vector<ExtensionPrefsObserver*>* observers) const = 0;
+
   // Returns true if loading background pages should be deferred.
   virtual bool DeferLoadingBackgroundHosts(
       content::BrowserContext* context) const = 0;
 
   virtual bool IsBackgroundPageAllowed(
       content::BrowserContext* context) const = 0;
 
   // Creates a new ExtensionHostDelegate instance.
   virtual scoped_ptr<ExtensionHostDelegate> CreateExtensionHostDelegate() = 0;
 
@@ skipping 29 matching lines @@
   // 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_