Remove SynchronousMode, as it is always ForceSynchronous.

Source/core/html/parser/HTMLDocumentParser.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 132 matching lines @@
 
     void startBackgroundParser();
     void stopBackgroundParser();
     void validateSpeculations(PassOwnPtr<ParsedChunk> lastChunk);
     void discardSpeculationsAndResumeFrom(PassOwnPtr<ParsedChunk> lastChunk, PassOwnPtr<HTMLToken>, PassOwnPtr<HTMLTokenizer>);
     void processParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk>);
     void pumpPendingSpeculations();
 
     Document* contextForParsingSession();
 
-    enum SynchronousMode {
-        AllowYield,
-        ForceSynchronous,
-    };
-    bool canTakeNextToken(SynchronousMode, PumpSession&);
-    void pumpTokenizer(SynchronousMode);
-    void pumpTokenizerIfPossible(SynchronousMode);
+    bool canTakeNextToken(PumpSession&);
+    void pumpTokenizer();
+    void pumpTokenizerIfPossible();
     void constructTreeFromHTMLToken(HTMLToken&);
     void constructTreeFromCompactHTMLToken(const CompactHTMLToken&);
 
     void runScriptsForPausedTreeBuilder();
     void resumeParsingAfterScriptExecution();
 
     void attemptToEnd();
     void endIfDelayed();
     void attemptToRunDeferredScriptsAndEnd();
     void end();
@@ skipping 32 matching lines @@
 
     bool m_isPinnedToMainThread;
     bool m_endWasDelayed;
     bool m_haveBackgroundParser;
     unsigned m_pumpSessionNestingLevel;
 };
 
 }
 
 #endif