Cleanup: Remove unneeded forward declarations from various chrome/browser subdirectories.

chrome/browser/webdata/keyword_table.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.
 
 #ifndef CHROME_BROWSER_WEBDATA_KEYWORD_TABLE_H_
 #define CHROME_BROWSER_WEBDATA_KEYWORD_TABLE_H_
 #pragma once
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/string16.h"
 #include "chrome/browser/webdata/web_database_table.h"
 #include "chrome/browser/search_engines/template_url_id.h"
 
-class GURL;
 class TemplateURL;
 
-namespace base {
-class Time;
-}
-
 // This class manages the |keywords| MetaTable within the SQLite database
 // passed to the constructor. It expects the following schema:
 //
 // Note: The database stores time in seconds, UTC.
 //
 // keywords                 Most of the columns mirror that of a field in
 //                          TemplateURL. See TemplateURL for more details.
 //   id
 //   short_name
 //   keyword
@@ skipping 81 matching lines @@
   // occurred (i.e. by third-party process trying to modify user settings).
   bool SetDefaultSearchProviderBackupID(int64 id);
 
   // Sets signature for the backup field.
   bool SetDefaultSearchProviderBackupIDSignature(int64 id);
 
   DISALLOW_COPY_AND_ASSIGN(KeywordTable);
 };
 
 #endif  // CHROME_BROWSER_WEBDATA_KEYWORD_TABLE_H_