Change Page::m_mainFrame to be a Frame.

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 "config.h"
 #include "modules/device_orientation/DeviceOrientationInspectorAgent.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/LocalFrame.h"
 #include "core/inspector/InspectorController.h"
@@ skipping 23 matching lines @@
 }
 
 DeviceOrientationInspectorAgent::DeviceOrientationInspectorAgent(Page& page)
     : InspectorBaseAgent<DeviceOrientationInspectorAgent>("DeviceOrientation")
     , m_page(page)
 {
 }
 
 DeviceOrientationController& DeviceOrientationInspectorAgent::controller()
 {
-    ASSERT(m_page.mainFrame()->document());
-    return DeviceOrientationController::from(*m_page.mainFrame()->document());
+    ASSERT(toLocalFrame(m_page.mainFrame())->document());
+    return DeviceOrientationController::from(*toLocalFrame(m_page.mainFrame())->document());
 }
 
 void DeviceOrientationInspectorAgent::setDeviceOrientationOverride(ErrorString* error, double alpha, double beta, double gamma)
 {
     m_state->setBoolean(DeviceOrientationInspectorAgentState::overrideEnabled, true);
     m_state->setDouble(DeviceOrientationInspectorAgentState::alpha, alpha);
     m_state->setDouble(DeviceOrientationInspectorAgentState::beta, beta);
     m_state->setDouble(DeviceOrientationInspectorAgentState::gamma, gamma);
     controller().setOverride(DeviceOrientationData::create(true, alpha, true, beta, true, gamma).get());
 }
@@ skipping 21 matching lines @@
 }
 
 void DeviceOrientationInspectorAgent::didCommitLoadForMainFrame()
 {
     // New document in main frame - apply override there.
     // No need to cleanup previous one, as it's already gone.
     restore();
 }
 
 } // namespace WebCore