Fixes conversion from NSImage to ImageSkia when NSImageRep has size which isn't it's pixel size

ui/gfx/image/image_mac.mm

Index: ui/gfx/image/image_mac.mm
diff --git a/ui/gfx/image/image_mac.mm b/ui/gfx/image/image_mac.mm
index eeed857ecf963897b72267607626022668bc8d77..68e541c36b0b47af44cdd76b76f2b387a58f6d5e 100644
--- a/ui/gfx/image/image_mac.mm
+++ b/ui/gfx/image/image_mac.mm
@@ -17,7 +17,8 @@ namespace internal {
 gfx::ImageSkia NSImageToImageSkia(NSImage* image) {
   gfx::ImageSkia image_skia;
   for (NSImageRep* imageRep in [image representations]) {
-    NSSize imageRepSize = [imageRep size];
+    NSSize imageRepSize =
+        NSMakeSize([imageRep pixelsWide], [imageRep pixelsHigh]);
     SkBitmap bitmap(gfx::NSImageRepToSkBitmap(imageRep, imageRepSize, false));
     if (!bitmap.isNull() && !bitmap.empty()) {
       float scaleFactor = imageRepSize.width / [image size].width;