Deprecate the unofficial -webkit-transition media feature

Source/core/css/MediaQueryEvaluator.cpp

 /*
  * CSS Media Query Evaluator
  *
  * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
@@ skipping 528 matching lines @@
 
 static bool animationMediaFeatureEval(CSSValue* value, RenderStyle*, Frame*, MediaFeaturePrefix op)
 {
     if (value) {
         float number;
         return numberValue(value, number) && compareValue(1, static_cast<int>(number), op);
     }
     return true;
 }
 
-static bool transitionMediaFeatureEval(CSSValue* value, RenderStyle*, Frame*, MediaFeaturePrefix op)
+static bool deprecatedTransitionMediaFeatureEval(CSSValue* value, RenderStyle*, Frame* frame, MediaFeaturePrefix op)
 {
+    UseCounter::countDeprecation(frame->document(), UseCounter::PrefixedTransitionMediaFeature);
+
     if (value) {
         float number;
         return numberValue(value, number) && compareValue(1, static_cast<int>(number), op);
     }
     return true;
 }
 
 static bool transform2dMediaFeatureEval(CSSValue* value, RenderStyle*, Frame*, MediaFeaturePrefix op)
 {
     if (value) {
@@ skipping 135 matching lines @@
     // and let trampoline functions override the prefix if prefix is
     // used
     EvalFunc func = gFunctionMap->get(expr->mediaFeature().impl());
     if (func)
         return func(expr->value(), m_style.get(), m_frame, NoPrefix);
 
     return false;
 }
 
 } // namespace