ASSERT -> DCHECK conversions in core/editing.

third_party/WebKit/Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 1221 matching lines @@
         // return such section as a Range, we skip this match and seek for the
         // next occurrence.
         // TODO(yosin) Handle this case.
         if (forward) {
             searchRange = EphemeralRangeTemplate<Strategy>(nextPositionOf(resultRange.startPosition(), PositionMoveType::GraphemeCluster), searchRange.endPosition());
         } else {
             searchRange = EphemeralRangeTemplate<Strategy>(searchRange.startPosition(), previousPositionOf(resultRange.endPosition(), PositionMoveType::GraphemeCluster));
         }
     }
 
-    ASSERT_NOT_REACHED();
+    NOTREACHED();
     return nullptr;
 }
 
 template <typename Strategy>
 static Range* findRangeOfStringAlgorithm(Document& document, const String& target, const EphemeralRangeTemplate<Strategy>& referenceRange, FindOptions options)
 {
     if (target.isEmpty())
         return nullptr;
 
     // Start from an edge of the reference range. Which edge is used depends on
@@ skipping 117 matching lines @@
 }
 
 DEFINE_TRACE(Editor)
 {
     visitor->trace(m_frame);
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_mark);
 }
 
 } // namespace blink