Rename FeatureObserver to UseCounter to make clear that all it stores are usage counts.

Source/WebCore/rendering/RenderLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 37 matching lines @@
 #include "CSSPropertyNames.h"
 #include "Chrome.h"
 #include "Document.h"
 #include "DocumentEventQueue.h"
 #include "EventHandler.h"
 #if ENABLE(CSS_FILTERS)
 #include "FEColorMatrix.h"
 #include "FEMerge.h"
 #include "FilterEffectRenderer.h"
 #endif
-#include "FeatureObserver.h"
+#include "UseCounter.h"
 #include "FloatConversion.h"
 #include "FloatPoint3D.h"
 #include "FloatRect.h"
 #include "FocusController.h"
 #include "Frame.h"
 #include "FrameLoader.h"
 #include "FrameLoaderClient.h"
 #include "FrameSelection.h"
 #include "FrameTree.h"
 #include "FrameView.h"
@@ skipping 5923 matching lines @@
         m_isNormalFlowOnly = isNormalFlowOnly;
         RenderLayer* p = parent();
         if (p)
             p->dirtyNormalFlowList();
         dirtyStackingContainerZOrderLists();
     }
 
     if (renderer()->style()->overflowX() == OMARQUEE && renderer()->style()->marqueeBehavior() != MNONE && renderer()->isBox()) {
         if (!m_marquee)
             m_marquee = adoptPtr(new RenderMarquee(this));
-        FeatureObserver::observe(renderer()->document(), renderer()->isHTMLMarquee() ? FeatureObserver::HTMLMarqueeElement : FeatureObserver::CSSOverflowMarquee);
+        UseCounter::observe(renderer()->document(), renderer()->isHTMLMarquee() ? UseCounter::HTMLMarqueeElement : UseCounter::CSSOverflowMarquee);
         m_marquee->updateMarqueeStyle();
     }
     else if (m_marquee) {
         m_marquee.clear();
     }
 
     updateScrollbarsAfterStyleChange(oldStyle);
     updateStackingContextsAfterStyleChange(oldStyle);
     // Overlay scrollbars can make this layer self-painting so we need
     // to recompute the bit once scrollbars have been updated.
     updateSelfPaintingLayer();
     updateOutOfFlowPositioned(oldStyle);
 
     if (!hasReflection() && m_reflection)
         removeReflection();
     else if (hasReflection()) {
         if (!m_reflection)
             createReflection();
-        FeatureObserver::observe(renderer()->document(), FeatureObserver::Reflection);
+        UseCounter::observe(renderer()->document(), UseCounter::Reflection);
         updateReflectionStyle();
     }
     
     // FIXME: Need to detect a swap from custom to native scrollbars (and vice versa).
     if (m_hBar)
         m_hBar->styleChanged();
     if (m_vBar)
         m_vBar->styleChanged();
     
     updateScrollCornerStyle();
@@ skipping 286 matching lines @@
     }
 }
 
 void showLayerTree(const WebCore::RenderObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif