Stop using controller as a variable name for FullscreenElementStack

Source/core/rendering/RenderFullScreen.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
@@ skipping 56 matching lines @@
 void RenderFullScreen::willBeDestroyed()
 {
     if (m_placeholder) {
         remove();
         if (!m_placeholder->beingDestroyed())
             m_placeholder->destroy();
         ASSERT(!m_placeholder);
     }
 
     // RenderObjects are unretained, so notify the document (which holds a pointer to a RenderFullScreen)
-    // if it's RenderFullScreen is destroyed.
-    FullscreenElementStack& controller = FullscreenElementStack::from(document());
-    if (controller.fullScreenRenderer() == this)
-        controller.fullScreenRendererDestroyed();
+    // if its RenderFullScreen is destroyed.
+    FullscreenElementStack& fullscreen = FullscreenElementStack::from(document());
+    if (fullscreen.fullScreenRenderer() == this)
+        fullscreen.fullScreenRendererDestroyed();
 
     RenderFlexibleBox::willBeDestroyed();
 }
 
 static PassRefPtr<RenderStyle> createFullScreenStyle()
 {
     RefPtr<RenderStyle> fullscreenStyle = RenderStyle::createDefaultStyle();
 
     // Create a stacking context:
     fullscreenStyle->setZIndex(INT_MAX);
@@ skipping 96 matching lines @@
     if (!m_placeholder) {
         m_placeholder = new RenderFullScreenPlaceholder(this);
         m_placeholder->setStyle(style);
         if (parent()) {
             parent()->addChild(m_placeholder, this);
             parent()->setNeedsLayoutAndPrefWidthsRecalcAndFullPaintInvalidation();
         }
     } else
         m_placeholder->setStyle(style);
 }