Migrate HostZoomMap to live in StoragePartition.

content/browser/resource_context_impl.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_RESOURCE_CONTEXT_IMPL_H_
 #define CONTENT_BROWSER_RESOURCE_CONTEXT_IMPL_H_
 
 #include "content/public/browser/resource_context.h"
 
 namespace content {
 
 class ChromeBlobStorageContext;
 class StreamContext;
 class BrowserContext;
-class HostZoomMap;
 class URLDataManagerBackend;
 
 // Getters for objects that are part of BrowserContext which are also used on
 // the IO thread. These are only accessed by content so they're not on the
 // public API.
 
 ChromeBlobStorageContext* GetChromeBlobStorageContextForResourceContext(
     ResourceContext* resource_context);
 
 StreamContext* GetStreamContextForResourceContext(
     ResourceContext* resource_context);
 
-HostZoomMap* GetHostZoomMapForResourceContext(ResourceContext* context);
-
 URLDataManagerBackend* GetURLDataManagerForResourceContext(
     ResourceContext* context);
 
 // Initialize the above data on the ResourceContext from a given BrowserContext.
 void InitializeResourceContext(BrowserContext* browser_context);
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RESOURCE_CONTEXT_IMPL_H_