Oilpan: move Page's PointerLockController object to the heap.

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index 8a88e23933b122312a1a3a15bceab2c683537d8b..eb0883dea89b2fe6b8e157587a0fc3a778f1cc25 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -586,6 +586,7 @@ void Page::trace(Visitor* visitor)
 {
     visitor->trace(m_dragCaretController);
     visitor->trace(m_dragController);
+    visitor->trace(m_pointerLockController);
     visitor->trace(m_multisamplingChangedObservers);
     visitor->trace(m_frameHost);
     WillBeHeapSupplementable<Page>::trace(visitor);