Refactoring activity logger.

Source/core/html/HTMLTrackElement.idl

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
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  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 interface HTMLTrackElement : HTMLElement {
     attribute DOMString kind;
-    [Reflect, URL, LogActivity=SetterOnly] attribute DOMString src;
+    [Reflect, URL] attribute DOMString src;
     [Reflect] attribute DOMString srclang;
     [Reflect] attribute DOMString label;
     [Reflect] attribute boolean default;
 
     const unsigned short NONE = 0;
     const unsigned short LOADING = 1;
     const unsigned short LOADED = 2;
     // Reflect is used for ERROR because it conflicts with a windows define.
     [Reflect=TRACK_ERROR] const unsigned short ERROR = 3;
     readonly attribute unsigned short readyState;
 
     readonly attribute TextTrack track;
 
     [Reflect, RuntimeEnabled=SubresourceIntegrity] attribute DOMString integrity;
 };