Avoid using declarations in headers which introduce symbol conflicts.

third_party/WebKit/Source/modules/device_orientation/DeviceOrientationInspectorAgent.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/device_orientation/DeviceOrientationInspectorAgent.h"
 
 #include "core/frame/LocalFrame.h"
 #include "core/inspector/InspectedFrames.h"
 #include "modules/device_orientation/DeviceOrientationController.h"
 #include "modules/device_orientation/DeviceOrientationData.h"
 #include "wtf/Assertions.h"
 
 namespace blink {
 
+using protocol::Response;
+
 namespace DeviceOrientationInspectorAgentState {
 static const char alpha[] = "alpha";
 static const char beta[] = "beta";
 static const char gamma[] = "gamma";
 static const char overrideEnabled[] = "overrideEnabled";
 }
 
 DeviceOrientationInspectorAgent::~DeviceOrientationInspectorAgent() {}
 
 DeviceOrientationInspectorAgent::DeviceOrientationInspectorAgent(
@@ skipping 61 matching lines @@
 void DeviceOrientationInspectorAgent::didCommitLoadForLocalFrame(
     LocalFrame* frame) {
   if (frame == m_inspectedFrames->root()) {
     // New document in main frame - apply override there.
     // No need to cleanup previous one, as it's already gone.
     restore();
   }
 }
 
 }  // namespace blink