Fix for building with ancient toolchain

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

Index: third_party/WebKit/Source/core/html/ImageDocument.cpp
diff --git a/third_party/WebKit/Source/core/html/ImageDocument.cpp b/third_party/WebKit/Source/core/html/ImageDocument.cpp
index 8485eecc4c54e0ba26ee12de69d8ed317b7808cc..6c7e24adb8e5f457301d8c1fb55ee7cbfdfcb751 100644
--- a/third_party/WebKit/Source/core/html/ImageDocument.cpp
+++ b/third_party/WebKit/Source/core/html/ImageDocument.cpp
@@ -399,7 +399,7 @@ void ImageDocument::updateImageStyle() {
           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);