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

Source/WebCore/html/HTMLFormControlElement.cpp

Index: Source/WebCore/html/HTMLFormControlElement.cpp
diff --git a/Source/WebCore/html/HTMLFormControlElement.cpp b/Source/WebCore/html/HTMLFormControlElement.cpp
index 3b393ed3d0ce7fde423ddbfc7138b14344485fe3..51b7538cad5e125f17ebe9a8eb1c2e7d6d8ee0a7 100644
--- a/Source/WebCore/html/HTMLFormControlElement.cpp
+++ b/Source/WebCore/html/HTMLFormControlElement.cpp
@@ -30,7 +30,7 @@
 #include "Event.h"
 #include "EventHandler.h"
 #include "EventNames.h"
-#include "FeatureObserver.h"
+#include "UseCounter.h"
 #include "Frame.h"
 #include "HTMLFieldSetElement.h"
 #include "HTMLFormElement.h"
@@ -126,7 +126,7 @@ void HTMLFormControlElement::parseAttribute(const QualifiedName& name, const Ato
 {
     if (name == formAttr) {
         formAttributeChanged();
-        FeatureObserver::observe(document(), FeatureObserver::FormAttribute);
+        UseCounter::observe(document(), UseCounter::FormAttribute);
     } else if (name == disabledAttr) {
         bool oldDisabled = m_disabled;
         m_disabled = !value.isNull();
@@ -146,10 +146,10 @@ void HTMLFormControlElement::parseAttribute(const QualifiedName& name, const Ato
         m_isRequired = !value.isNull();
         if (wasRequired != m_isRequired)
             requiredAttributeChanged();
-        FeatureObserver::observe(document(), FeatureObserver::RequiredAttribute);
+        UseCounter::observe(document(), UseCounter::RequiredAttribute);
     } else if (name == autofocusAttr) {
         HTMLElement::parseAttribute(name, value);
-        FeatureObserver::observe(document(), FeatureObserver::AutoFocusAttribute);
+        UseCounter::observe(document(), UseCounter::AutoFocusAttribute);
     } else
         HTMLElement::parseAttribute(name, value);
 }