Replace ENABLE(ASSERT) with DCHECK_IS_ON().

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

 /*
  * Copyright (C) 2013 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 51 matching lines @@
   struct Checkpoint {
     Checkpoint(const SegmentedString& i, size_t n, size_t t)
         : input(i),
           numberOfSegmentsAlreadyAppended(n),
           tokensExtractedSincePreviousCheckpoint(t) {}
 
     SegmentedString input;
     size_t numberOfSegmentsAlreadyAppended;
     size_t tokensExtractedSincePreviousCheckpoint;
 
-#if ENABLE(ASSERT)
+#if DCHECK_IS_ON()
     bool isNull() const {
       return input.isEmpty() && !numberOfSegmentsAlreadyAppended;
     }
 #endif
     void clear() {
       input.clear();
       numberOfSegmentsAlreadyAppended = 0;
       tokensExtractedSincePreviousCheckpoint = 0;
     }
   };
 
   SegmentedString m_current;
   Vector<String> m_segments;
   Vector<Checkpoint> m_checkpoints;
 
   // Note: These indicies may === vector.size(), in which case there are no
   // valid checkpoints/segments at this time.
   size_t m_firstValidCheckpointIndex;
   size_t m_firstValidSegmentIndex;
   size_t m_totalCheckpointTokenCount;
 
   void updateTotalCheckpointTokenCount();
 };
 
 }  // namespace blink
 
 #endif  // BackgroundHTMLInputStream_h