introduce chrome/browser/common directory and move url_database(and its dependencies)

chrome/browser/history/top_sites_database.cc

 // 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.
 
 #include "base/file_util.h"
 #include "base/memory/ref_counted.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "chrome/browser/diagnostics/sqlite_diagnostics.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/history/top_sites_database.h"
 #include "sql/connection.h"
+#include "sql/statement.h"
 #include "sql/transaction.h"
 
 namespace history {
 
 // From the version 1 to 2, one column was added. Old versions of Chrome
 // should be able to read version 2 files just fine.
 static const int kVersionNumber = 2;
 
 TopSitesDatabase::TopSitesDatabase() : may_need_history_migration_(false) {
 }
@@ skipping 356 matching lines @@
 
   if (!db->Open(db_name)) {
     LOG(ERROR) << db->GetErrorMessage();
     return NULL;
   }
 
   return db.release();
 }
 
 }  // namespace history