Remove code for deprecated and rotted histogram.

third_party/WebKit/Source/core/html/parser/HTMLScriptRunner.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 81 matching lines @@
     OwnPtrWillBeMember<PendingScript> m_parserBlockingScript;
     // http://www.whatwg.org/specs/web-apps/current-work/#list-of-scripts-that-will-execute-when-the-document-has-finished-parsing
     WillBeHeapDeque<OwnPtrWillBeMember<PendingScript>> m_scriptsToExecuteAfterParsing;
     unsigned m_scriptNestingLevel;
 
     // We only want stylesheet loads to trigger script execution if script
     // execution is currently stopped due to stylesheet loads, otherwise we'd
     // cause nested script execution when parsing <style> tags since </style>
     // tags can cause Document to call executeScriptsWaitingForResources.
     bool m_hasScriptsWaitingForResources;
-
-    // For tracking the times between script load and compilation, we need to
-    // know whether a parser blocking script was loaded previously, or whether
-    // it's really loaded when requested.
-    bool m_parserBlockingScriptAlreadyLoaded;
 };
 
 } // namespace blink
 
 #endif