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

Source/WebCore/page/Page.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012, 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
@@ skipping 1193 matching lines @@
 #endif
     info.addMember(m_inspectorController, "inspectorController");
     info.addMember(m_pointerLockController, "pointerLockController");
     info.addMember(m_scrollingCoordinator, "scrollingCoordinator");
     info.addMember(m_settings, "settings");
     info.addMember(m_progress, "progress");
     info.addMember(m_backForwardController, "backForwardController");
     info.addMember(m_mainFrame, "mainFrame");
     info.addMember(m_pluginData, "pluginData");
     info.addMember(m_theme, "theme");
-    info.addMember(m_featureObserver, "featureObserver");
+    info.addMember(m_UseCounter, "UseCounter");
     info.addMember(m_groupName, "groupName");
     info.addMember(m_pagination, "pagination");
     info.addMember(m_userStyleSheet, "userStyleSheet");
     info.addMember(m_singlePageGroup, "singlePageGroup");
     info.addMember(m_group, "group");
     info.addMember(m_sessionStorage, "sessionStorage");
     info.addMember(m_relevantUnpaintedRenderObjects, "relevantUnpaintedRenderObjects");
     info.addMember(m_topRelevantPaintedRegion, "relevantPaintedRegion");
     info.addMember(m_bottomRelevantPaintedRegion, "relevantPaintedRegion");
     info.addMember(m_relevantUnpaintedRegion, "relevantUnpaintedRegion");
@@ skipping 24 matching lines @@
     , plugInClient(0)
     , validationMessageClient(0)
 {
 }
 
 Page::PageClients::~PageClients()
 {
 }
 
 } // namespace WebCore