Migrate WTF::HashSet::add() to ::insert() [part 1 of N]

third_party/WebKit/Source/core/html/canvas/CanvasRenderingContext.cpp

 /*
  * Copyright (C) 2009 Apple 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 153 matching lines @@
   }
 
   DCHECK_EQ(!canvas(),
             !!destinationSecurityOrigin);  // Must have one or the other
   bool taintOrigin = imageSource->wouldTaintOrigin(
       destinationSecurityOrigin ? destinationSecurityOrigin
                                 : canvas()->getSecurityOrigin());
 
   if (hasURL) {
     if (taintOrigin)
-      m_dirtyURLs.add(sourceURL.getString());
+      m_dirtyURLs.insert(sourceURL.getString());
     else
-      m_cleanURLs.add(sourceURL.getString());
+      m_cleanURLs.insert(sourceURL.getString());
   }
   return taintOrigin;
 }
 
 DEFINE_TRACE(CanvasRenderingContext) {
   visitor->trace(m_canvas);
   visitor->trace(m_offscreenCanvas);
 }
 
 }  // namespace blink