[cleanup, battery] Don't include unneeded headers.

third_party/WebKit/Source/modules/battery/NavigatorBattery.cpp

 // Copyright 2014 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 "modules/battery/NavigatorBattery.h"
 
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/LocalDOMWindow.h"
+#include "core/frame/Navigator.h"
 #include "modules/battery/BatteryManager.h"
 
 namespace blink {
 
 NavigatorBattery::NavigatorBattery(Navigator& navigator)
     : Supplement<Navigator>(navigator) {}
 
 ScriptPromise NavigatorBattery::getBattery(ScriptState* script_state,
                                            Navigator& navigator) {
   return NavigatorBattery::From(navigator).getBattery(script_state);
@@ skipping 36 matching lines @@
   }
   return *supplement;
 }
 
 DEFINE_TRACE(NavigatorBattery) {
   visitor->Trace(battery_manager_);
   Supplement<Navigator>::Trace(visitor);
 }
 
 }  // namespace blink