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

Source/WebCore/html/HTMLTextFormControlElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.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
@@ skipping 13 matching lines @@
 
 #include "config.h"
 #include "HTMLTextFormControlElement.h"
 
 #include "AXObjectCache.h"
 #include "Attribute.h"
 #include "ChromeClient.h"
 #include "Document.h"
 #include "Event.h"
 #include "EventNames.h"
-#include "FeatureObserver.h"
+#include "UseCounter.h"
 #include "Frame.h"
 #include "HTMLBRElement.h"
 #include "HTMLFormElement.h"
 #include "HTMLInputElement.h"
 #include "HTMLNames.h"
 #include "NodeRenderingContext.h"
 #include "NodeTraversal.h"
 #include "RenderBox.h"
 #include "RenderTextControl.h"
 #include "RenderTheme.h"
@@ skipping 459 matching lines @@
     if (Frame* frame = document()->frame()) {
         if (frame->selection()->isRange() && userTriggered)
             dispatchEvent(Event::create(eventNames().selectEvent, true, false));
     }
 }
 
 void HTMLTextFormControlElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
 {
     if (name == placeholderAttr) {
         updatePlaceholderVisibility(true);
-        FeatureObserver::observe(document(), FeatureObserver::PlaceholderAttribute);
+        UseCounter::observe(document(), UseCounter::PlaceholderAttribute);
     } else
         HTMLFormControlElementWithState::parseAttribute(name, value);
 }
 
 bool HTMLTextFormControlElement::lastChangeWasUserEdit() const
 {
     if (!isTextFormControl())
         return false;
     return m_lastChangeWasUserEdit;
 }
@@ skipping 148 matching lines @@
 }
 
 void HTMLTextFormControlElement::reportMemoryUsage(MemoryObjectInfo* memoryObjectInfo) const
 {
     MemoryClassInfo info(memoryObjectInfo, this, WebCoreMemoryTypes::DOM);
     HTMLFormControlElementWithState::reportMemoryUsage(memoryObjectInfo);
     info.addMember(m_textAsOfLastFormControlChangeEvent, "textAsOfLastFormControlChangeEvent");
 }
 
 } // namespace Webcore