Code cleanup: remove unnecessary casts.

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index f3c093c2a37dbe3811c44b3143fb8eb487cd7611..6fe8e3d36b3842d196ba75eb906dd4ae79dfc285 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -632,7 +632,7 @@ bool WebViewImpl::handleGestureEvent(const WebGestureEvent& event)
         m_globalPositionOnFlingStart = WebPoint(event.globalX, event.globalY);
         m_flingModifier = event.modifiers;
         m_flingSourceDevice = event.sourceDevice;
-        OwnPtr<WebGestureCurve> flingCurve = adoptPtr(Platform::current()->createFlingAnimationCurve(static_cast<WebGestureDevice>(event.sourceDevice), WebFloatPoint(event.data.flingStart.velocityX, event.data.flingStart.velocityY), WebSize()));
+        OwnPtr<WebGestureCurve> flingCurve = adoptPtr(Platform::current()->createFlingAnimationCurve(event.sourceDevice, WebFloatPoint(event.data.flingStart.velocityX, event.data.flingStart.velocityY), WebSize()));
         ASSERT(flingCurve);
         m_gestureAnimation = WebActiveGestureAnimation::createAtAnimationStart(flingCurve.release(), this);
         scheduleAnimation();
@@ -780,7 +780,7 @@ void WebViewImpl::transferActiveWheelFlingAnimation(const WebActiveWheelFlingPar
     m_positionOnFlingStart = parameters.point;
     m_globalPositionOnFlingStart = parameters.globalPoint;
     m_flingModifier = parameters.modifiers;
-    OwnPtr<WebGestureCurve> curve = adoptPtr(Platform::current()->createFlingAnimationCurve(static_cast<WebGestureDevice>(parameters.sourceDevice), WebFloatPoint(parameters.delta), parameters.cumulativeScroll));
+    OwnPtr<WebGestureCurve> curve = adoptPtr(Platform::current()->createFlingAnimationCurve(parameters.sourceDevice, WebFloatPoint(parameters.delta), parameters.cumulativeScroll));
     ASSERT(curve);
     m_gestureAnimation = WebActiveGestureAnimation::createWithTimeOffset(curve.release(), this, parameters.startTime);
     scheduleAnimation();