Assume FrameView::m_frame is never NULL

Source/core/page/scrolling/ScrollingCoordinator.cpp

Index: Source/core/page/scrolling/ScrollingCoordinator.cpp
diff --git a/Source/core/page/scrolling/ScrollingCoordinator.cpp b/Source/core/page/scrolling/ScrollingCoordinator.cpp
index ca740b97dba7be8b11eebb19597e7e2fe2557c6f..5a05988ff8b2e3a5ea30d28366f6cd2ff68b07b7 100644
--- a/Source/core/page/scrolling/ScrollingCoordinator.cpp
+++ b/Source/core/page/scrolling/ScrollingCoordinator.cpp
@@ -711,11 +711,7 @@ bool ScrollingCoordinator::isForMainFrame(ScrollableArea* scrollableArea) const
 
 GraphicsLayer* ScrollingCoordinator::scrollLayerForFrameView(FrameView* frameView)
 {
-    Frame* frame = frameView->frame();
-    if (!frame)
-        return 0;
-
-    RenderView* renderView = frame->contentRenderer();
+    RenderView* renderView = frameView->frame()->contentRenderer();
     if (!renderView)
         return 0;
     return renderView->compositor()->scrollLayer();