Various cleanups to compositing code

Source/core/rendering/compositing/CompositingReasonFinder.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/rendering/compositing/CompositingReasonFinder.h"
 
 #include "CSSPropertyNames.h"
 #include "HTMLNames.h"
 #include "core/frame/FrameView.h"
@@ skipping 74 matching lines @@
 bool CompositingReasonFinder::requiresCompositingForScrollableFrame() const
 {
     // Need this done first to determine overflow.
     ASSERT(!m_renderView.needsLayout());
     if (isMainFrame())
         return false;
 
     if (!(m_compositingTriggers & ScrollableInnerFrameTrigger))
         return false;
 
-    FrameView* frameView = m_renderView.frameView();
-    return frameView->isScrollable();
+    return m_renderView.frameView()->isScrollable();
 }
 
 CompositingReasons CompositingReasonFinder::styleDeterminedReasons(RenderObject* renderer) const
 {
     CompositingReasons directReasons = CompositingReasonNone;
 
     RenderStyle* style = renderer->style();
 
     if (requiresCompositingForTransform(renderer))
         directReasons |= CompositingReason3DTransform;
@@ skipping 150 matching lines @@
             if (viewportConstrainedNotCompositedReason)
                 *viewportConstrainedNotCompositedReason = RenderLayer::NotCompositedForBoundsOutOfView;
             return false;
         }
     }
 
     return true;
 }
 
 }