Clean up some of the includes following my refactoring patch.

chrome/browser/storage/storage_info_fetcher.h

 // Copyright 2016 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 CHROME_BROWSER_STORAGE_STORAGE_INFO_FETCHER_H_
 #define CHROME_BROWSER_STORAGE_STORAGE_INFO_FETCHER_H_
 
 #include "base/memory/ref_counted.h"
-#include "storage/browser/quota/quota_manager.h"
+#include "storage/browser/quota/quota_callbacks.h"
+
+namespace storage {
+class QuotaManager;
+}
 
 class Profile;
 
 // Asynchronously fetches the amount of storage used by websites.
 class StorageInfoFetcher :
     public base::RefCountedThreadSafe<StorageInfoFetcher> {
  public:
   using FetchCallback =
       base::Callback<void(const storage::UsageInfoEntries&)>;
   using ClearCallback =
@@ skipping 42 matching lines @@
   // The callback to use when fetching is complete.
   FetchCallback fetch_callback_;
 
   // The callback to use when storage has been cleared.
   ClearCallback clear_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(StorageInfoFetcher);
 };
 
 #endif  // CHROME_BROWSER_STORAGE_STORAGE_INFO_FETCHER_H_