Page::chrome() should return a reference.

Source/core/page/PointerLockController.cpp

 /*
  * Copyright (C) 2012 Google 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
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 48 matching lines @@
         return;
     }
 
     if (m_element) {
         if (m_element->document() != target->document()) {
             enqueueEvent(eventNames().webkitpointerlockerrorEvent, target);
             return;
         }
         enqueueEvent(eventNames().webkitpointerlockchangeEvent, target);
         m_element = target;
-    } else if (m_page->chrome()->client()->requestPointerLock()) {
+    } else if (m_page->chrome().client()->requestPointerLock()) {
         m_lockPending = true;
         m_element = target;
     } else {
         enqueueEvent(eventNames().webkitpointerlockerrorEvent, target);
     }
 }
 
 void PointerLockController::requestPointerUnlock()
 {
-    return m_page->chrome()->client()->requestPointerUnlock();
+    return m_page->chrome().client()->requestPointerUnlock();
 }
 
 void PointerLockController::elementRemoved(Element* element)
 {
     if (m_element == element) {
         m_documentOfRemovedElementWhileWaitingForUnlock = m_element->document();
         // Set element null immediately to block any future interaction with it
         // including mouse events received before the unlock completes.
         clearElement();
         requestPointerUnlock();
@@ skipping 61 matching lines @@
         enqueueEvent(type, element->document());
 }
 
 void PointerLockController::enqueueEvent(const AtomicString& type, Document* document)
 {
     if (document)
         document->enqueueDocumentEvent(Event::create(type, true, false));
 }
 
 } // namespace WebCore