[oilpan] Move EventHandler to the heap

Source/WebKit/chromium/src/ViewportAnchor.h

Index: Source/WebKit/chromium/src/ViewportAnchor.h
diff --git a/Source/WebKit/chromium/src/ViewportAnchor.h b/Source/WebKit/chromium/src/ViewportAnchor.h
index 551d7d1fe95572dff9766e594a4c0c0f116f9edd..8a7720b99e451a4c8477bc32987dd6fd40cbf044 100644
--- a/Source/WebKit/chromium/src/ViewportAnchor.h
+++ b/Source/WebKit/chromium/src/ViewportAnchor.h
@@ -55,13 +55,14 @@ namespace WebKit {
 class ViewportAnchor {
     WTF_MAKE_NONCOPYABLE(ViewportAnchor);
 public:
-    explicit ViewportAnchor(WebCore::EventHandler* eventHandler);
+    explicit ViewportAnchor(HANDLE_FORMAL(WebCore::EventHandler) eventHandler);
 
     void setAnchor(const WebCore::IntRect& viewRect, const WebCore::FloatSize& anchorInViewCoords);
 
     WebCore::IntPoint computeOrigin(const WebCore::IntSize& currentViewSize) const;
 
 private:
+    // FIXME(oilpan): This should be a strong pointer.
     WebCore::EventHandler* m_eventHandler;
 
     WebCore::IntRect m_viewRect;