Oilpan: fix build after r173245.

Source/core/page/EventHandler.cpp

Index: Source/core/page/EventHandler.cpp
diff --git a/Source/core/page/EventHandler.cpp b/Source/core/page/EventHandler.cpp
index 7a7d9d32f284f16d4cf130e72ac92ab40fd4932d..21879f6581f8950c00aa2fe504828952711a2b83 100644
--- a/Source/core/page/EventHandler.cpp
+++ b/Source/core/page/EventHandler.cpp
@@ -3640,7 +3640,6 @@ bool EventHandler::handleTouchEvent(const PlatformTouchEvent& event)
     // Now iterate the changedTouches list and m_targets within it, sending
     // events to the targets as required.
     bool swallowedEvent = false;
-    RefPtrWillBeRawPtr<TouchList> emptyList = TouchList::create();
     for (unsigned state = 0; state != PlatformTouchPoint::TouchStateEnd; ++state) {
         if (!changedTouches[state].m_touches)
             continue;