Clean up a few TODO items.

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index 25bf9c9d0d12d7f0474601eca0c1fec3b62955e8..aee7ccaf6aaf74f8ee0bed3031dc6e1210a9df0e 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -924,10 +924,6 @@ bool RenderWidgetHostViewWin::CopyFromCompositingSurface(
       size, output->getTopDevice()->accessBitmap(true).getPixels());
 }
 
-void RenderWidgetHostViewWin::UnhandledWheelEvent(
-    const WebKit::WebMouseWheelEvent& event) {
-}
-
 void RenderWidgetHostViewWin::ProcessTouchAck(
     WebKit::WebInputEvent::Type type, bool processed) {
   if (type == WebKit::WebInputEvent::TouchStart)