Removed incorrect comment about raw pointer.

third_party/WebKit/Source/core/css/MediaValuesDynamic.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MediaValuesDynamic_h
 #define MediaValuesDynamic_h
 
 #include "core/css/MediaValues.h"
 
 namespace blink {
@@ skipping 33 matching lines @@
 
   DECLARE_VIRTUAL_TRACE();
 
  protected:
   MediaValuesDynamic(LocalFrame*);
   MediaValuesDynamic(LocalFrame*,
                      bool overriddenViewportDimensions,
                      double viewportWidth,
                      double viewportHeight);
 
-  // This raw ptr is safe, as MediaValues would not outlive MediaQueryEvaluator,
-  // and MediaQueryEvaluator is reset on |Document::detachLayoutTree|.
   Member<LocalFrame> m_frame;
   bool m_viewportDimensionsOverridden;
   double m_viewportWidthOverride;
   double m_viewportHeightOverride;
 };
 
 }  // namespace blink
 
 #endif  // MediaValuesDynamic_h