Remove duplicated headers from modules/

Source/modules/webdatabase/SQLTransactionBackend.cpp

 /*
  * Copyright (C) 2007, 2008, 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 26 matching lines @@
 #include "modules/webdatabase/DatabaseAuthorizer.h"
 #include "modules/webdatabase/DatabaseBackend.h"
 #include "modules/webdatabase/DatabaseContext.h"
 #include "modules/webdatabase/DatabaseThread.h"
 #include "modules/webdatabase/DatabaseTracker.h"
 #include "modules/webdatabase/SQLError.h"
 #include "modules/webdatabase/SQLStatementBackend.h"
 #include "modules/webdatabase/SQLTransactionClient.h"
 #include "modules/webdatabase/SQLTransactionCoordinator.h"
 #include "wtf/StdLibExtras.h"
-#include "wtf/text/WTFString.h"
 
 
 // How does a SQLTransaction work?
 // ==============================
 // The SQLTransaction is a state machine that executes a series of states / steps.
 //
 // The work of the transaction states are defined in section of 4.3.2 of the
 // webdatabase spec: http://dev.w3.org/html5/webdatabase/#processing-model
 //
 // the State Transition Graph at a glance:
@@ skipping 766 matching lines @@
 }
 
 SQLTransactionState SQLTransactionBackend::sendToFrontendState()
 {
     ASSERT(m_nextState != SQLTransactionState::Idle);
     m_frontend->requestTransitToState(m_nextState);
     return SQLTransactionState::Idle;
 }
 
 } // namespace WebCore