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

Source/WebCore/page/Page.h

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #ifndef Page_h
 #define Page_h
 
-#include "FeatureObserver.h"
+#include "UseCounter.h"
 #include "FindOptions.h"
 #include "FrameLoaderTypes.h"
 #include "LayoutMilestones.h"
 #include "LayoutRect.h"
 #include "PageVisibilityState.h"
 #include "Pagination.h"
 #include "PlatformScreen.h"
 #include "Region.h"
 #include "Supplementable.h"
 #include "ViewportArguments.h"
@@ skipping 149 matching lines @@
 
     ScrollingCoordinator* scrollingCoordinator();
 
     String mainThreadScrollingReasonsAsText();
     PassRefPtr<ClientRectList> nonFastScrollableRects(const Frame*);
 
     Settings* settings() const { return m_settings.get(); }
     ProgressTracker* progress() const { return m_progress.get(); }
     BackForwardController* backForward() const { return m_backForwardController.get(); }
 
-    FeatureObserver* featureObserver() { return &m_featureObserver; }
+    UseCounter* useCounter() { return &m_UseCounter; }
 
     enum ViewMode {
         ViewModeInvalid,
         ViewModeWindowed,
         ViewModeFloating,
         ViewModeFullscreen,
         ViewModeMaximized,
         ViewModeMinimized
     };
     static ViewMode stringToViewMode(const String&);
@@ skipping 166 matching lines @@
     RefPtr<Frame> m_mainFrame;
 
     mutable RefPtr<PluginData> m_pluginData;
 
     RefPtr<RenderTheme> m_theme;
 
     EditorClient* m_editorClient;
     PlugInClient* m_plugInClient;
     ValidationMessageClient* m_validationMessageClient;
 
-    FeatureObserver m_featureObserver;
+    UseCounter m_UseCounter;
 
     int m_subframeCount;
     String m_groupName;
     bool m_openedByDOM;
 
     bool m_tabKeyCyclesThroughElements;
     bool m_defersLoading;
     unsigned m_defersLoadingCallCount;
 
     bool m_inLowQualityInterpolationMode;
@@ skipping 56 matching lines @@
 inline PageGroup& Page::group()
 {
     if (!m_group)
         initGroup();
     return *m_group;
 }
 
 } // namespace WebCore
     
 #endif // Page_h