Get rid of the link time dependency between content and chrome through the geolocation code.

content/browser/geolocation/access_token_store.h

 // Copyright (c) 2011 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.
 
 // Defines the Geolocation access token store, and associated factory function.
 // An access token store is responsible for providing the API to persist
 // access tokens, one at a time, and to load them back on mass.
 // The API is a little more complex than one might wish, due to the need for
 // prefs access to happen asynchronously on the UI thread.
 // This API is provided as abstract base classes to allow mocking and testing
 // of clients, without dependency on browser process singleton objects etc.
 
 #ifndef CONTENT_BROWSER_GEOLOCATION_ACCESS_TOKEN_STORE_H_
 #define CONTENT_BROWSER_GEOLOCATION_ACCESS_TOKEN_STORE_H_
 #pragma once
 
 #include <map>
 
 #include "base/callback_old.h"
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
 #include "content/browser/cancelable_request.h"
 #include "googleurl/src/gurl.h"
 
 class GURL;
-class PrefService;
 
 // Provides storage for the access token used in the network request.
 class AccessTokenStore : public base::RefCountedThreadSafe<AccessTokenStore>,
                          public CancelableRequestProvider {
  public:
-  static void RegisterPrefs(PrefService* prefs);
 
   // Map of server URLs to associated access token.
   typedef std::map<GURL, string16> AccessTokenSet;
   typedef Callback1<AccessTokenSet>::Type LoadAccessTokensCallbackType;
   // callback will be invoked once, after existing access tokens have
   // been loaded from persistent store. Takes ownership of callback.
   // Returns a handle which can subsequently be used with CancelRequest().
   Handle LoadAccessTokens(CancelableRequestConsumerBase* consumer,
                           LoadAccessTokensCallbackType* callback);
 
   virtual void SaveAccessToken(
       const GURL& server_url, const string16& access_token) = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<AccessTokenStore>;
   AccessTokenStore();
   virtual ~AccessTokenStore();
 
   virtual void DoLoadAccessTokens(
       scoped_refptr<CancelableRequest<LoadAccessTokensCallbackType> > req) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AccessTokenStore);
 };
 
-// Creates a new access token store backed by the global chome prefs.
-AccessTokenStore* NewChromePrefsAccessTokenStore();
-
 #endif  // CONTENT_BROWSER_GEOLOCATION_ACCESS_TOKEN_STORE_H_