Cleanup: Remove unneeded includes of pref_names.h

chrome/browser/history/in_memory_history_backend.cc

 // Copyright (c) 2010 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.
 
 #include "chrome/browser/history/in_memory_history_backend.h"
 
 #include <set>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/history/history_notifications.h"
 #include "chrome/browser/history/in_memory_database.h"
 #include "chrome/browser/history/in_memory_url_index.h"
 #include "chrome/browser/history/url_database.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/notification_details.h"
 #include "chrome/common/notification_source.h"
-#include "chrome/common/pref_names.h"
 
 namespace history {
 
 // If a page becomes starred we use this id in place of the real starred id.
 // See note in OnURLsStarred.
 static const StarID kBogusStarredID = 0x0FFFFFFF;
 
 InMemoryHistoryBackend::InMemoryHistoryBackend()
     : profile_(NULL) {
 }
@@ skipping 154 matching lines @@
 
 bool InMemoryHistoryBackend::HasKeyword(const GURL& url) {
   URLID id = db_->GetRowForURL(url, NULL);
   if (!id)
     return false;
 
   return db_->GetKeywordSearchTermRow(id, NULL);
 }
 
 }  // namespace history