Chrome::client() should return a ChromeClient reference.

Source/core/page/PointerLockController.cpp

Index: Source/core/page/PointerLockController.cpp
diff --git a/Source/core/page/PointerLockController.cpp b/Source/core/page/PointerLockController.cpp
index 5eb25ba9c44982067ca5bb7af9097e9a8e23bb29..26c4c9dfc7da720ee89bcc2908a649aa7ff15790 100644
--- a/Source/core/page/PointerLockController.cpp
+++ b/Source/core/page/PointerLockController.cpp
@@ -65,7 +65,7 @@ void PointerLockController::requestPointerLock(Element* target)
         }
         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 {
@@ -75,7 +75,7 @@ void PointerLockController::requestPointerLock(Element* target)
 
 void PointerLockController::requestPointerUnlock()
 {
-    return m_page->chrome().client()->requestPointerUnlock();
+    return m_page->chrome().client().requestPointerUnlock();
 }
 
 void PointerLockController::elementRemoved(Element* element)