Pass implementation object to supplemental classes by reference

Source/modules/device_orientation/DeviceOrientationInspectorAgent.h

 // 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.
 
 #ifndef DeviceOrientationInspectorAgent_h
 #define DeviceOrientationInspectorAgent_h
 
 #include "core/inspector/InspectorBaseAgent.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class Page;
 
 typedef String ErrorString;
 
 class DeviceOrientationInspectorAgent FINAL : public InspectorBaseAgent<DeviceOrientationInspectorAgent>, public InspectorBackendDispatcher::DeviceOrientationCommandHandler {
     WTF_MAKE_NONCOPYABLE(DeviceOrientationInspectorAgent);
 public:
-    static void provideTo(Page*);
+    static void provideTo(Page&);
 
     virtual ~DeviceOrientationInspectorAgent();
 
     // Protocol methods.
     virtual void setDeviceOrientationOverride(ErrorString*, double, double, double) OVERRIDE;
     virtual void clearDeviceOrientationOverride(ErrorString*) OVERRIDE;
 
 private:
-    explicit DeviceOrientationInspectorAgent(Page*);
-    Page* m_page;
+    explicit DeviceOrientationInspectorAgent(Page&);
+    Page& m_page;
 };
 
 } // namespace WebCore
 
 
 #endif // !defined(DeviceOrientationInspectorAgent_h)