Fix for building with ancient toolchain

third_party/WebKit/Source/core/html/ImageDocument.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 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 381 matching lines @@
           // checker size is dynamically adjusted to account for how much the
           // page is currently being scaled.
           scale = frame()->host()->visualViewport().scale();
         } else {
           // The checker pattern is initialized based on how large the image is
           // relative to the viewport.
           int viewportWidth = frame()->host()->visualViewport().size().width();
           scale = viewportWidth / static_cast<double>(calculateDivWidth());
         }
 
-        newCheckerSize = round(std::max(1.0, newCheckerSize / scale));
+        newCheckerSize = std::round(std::max(1.0, newCheckerSize / scale));
       } else {
         // In desktop mode, the user can click on the image to zoom in or out.
         DCHECK_EQ(m_shrinkToFitMode, Desktop);
         if (imageFitsInWindow()) {
           newCursorMode = Default;
         } else {
           newCursorMode = m_shouldShrinkImage ? ZoomIn : ZoomOut;
         }
       }
 
@@ skipping 190 matching lines @@
 }
 
 bool ImageEventListener::operator==(const EventListener& listener) const {
   if (const ImageEventListener* imageEventListener =
           ImageEventListener::cast(&listener))
     return m_doc == imageEventListener->m_doc;
   return false;
 }
 
 }  // namespace blink