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

Source/WebCore/page/UseCounter.cpp

 /*
  * Copyright (C) 2012 Google, 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 #include "config.h"
-#include "FeatureObserver.h"
+#include "UseCounter.h"
 
 #include "DOMWindow.h"
 #include "Document.h"
 #include "HistogramSupport.h"
 #include "Page.h"
 
 namespace WebCore {
 
-FeatureObserver::FeatureObserver()
+UseCounter::UseCounter()
 {
 }
 
-FeatureObserver::~FeatureObserver()
+UseCounter::~UseCounter()
 {
     // We always log PageDestruction so that we have a scale for the rest of the features.
     HistogramSupport::histogramEnumeration("WebCore.FeatureObserver", PageDestruction, NumberOfFeatures);
 
     updateMeasurements();
 }
 
-void FeatureObserver::updateMeasurements()
+void UseCounter::updateMeasurements()
 {
     HistogramSupport::histogramEnumeration("WebCore.FeatureObserver", PageVisits, NumberOfFeatures);
 
-    if (!m_featureBits)
+    if (!m_countBits)
         return;
 
     for (unsigned i = 0; i < NumberOfFeatures; ++i) {
-        if (m_featureBits->quickGet(i))
+        if (m_countBits->quickGet(i))
             HistogramSupport::histogramEnumeration("WebCore.FeatureObserver", i, NumberOfFeatures);
     }
 
-    // Clearing feature bits is timing sensitive. Ports other than chromium do not use HistogramSupport,
-    // and pull the results on certain navigation events instead.
-    m_featureBits->clearAll();
+    // Clearing count bits is timing sensitive.
+    m_countBits->clearAll();
 }
 
-void FeatureObserver::didCommitLoad()
+void UseCounter::didCommitLoad()
 {
     updateMeasurements();
 }
 
-void FeatureObserver::observe(Document* document, Feature feature)
+void UseCounter::observe(Document* document, Feature feature)
 {
     if (!document)
         return;
 
     Page* page = document->page();
     if (!page)
         return;
 
-    page->featureObserver()->didObserve(feature);
+    page->useCounter()->didObserve(feature);
 }
 
-void FeatureObserver::observe(DOMWindow* domWindow, Feature feature)
+void UseCounter::observe(DOMWindow* domWindow, Feature feature)
 {
     ASSERT(domWindow);
     observe(domWindow->document(), feature);
 }
 
 } // namespace WebCore