Use initialized canvas to create network icons.

ui/chromeos/network/network_icon.cc

Index: ui/chromeos/network/network_icon.cc
diff --git a/ui/chromeos/network/network_icon.cc b/ui/chromeos/network/network_icon.cc
index 395bd620edc3b6865b5b0d0135e75f252c703fcc..591ee14a453b6bfe93b01c961bda86d8660215d5 100644
--- a/ui/chromeos/network/network_icon.cc
+++ b/ui/chromeos/network/network_icon.cc
@@ -230,10 +230,9 @@ class NetworkIconImageSource : public gfx::ImageSkiaSource {
   // TODO(pkotwicz): Figure out what to do when a new image resolution becomes
   // available.
   gfx::ImageSkiaRep GetImageForScale(float scale) override {
-    gfx::ImageSkiaRep icon_rep = icon_.GetRepresentation(scale);
-    if (icon_rep.is_null())
-      return gfx::ImageSkiaRep();
-    gfx::Canvas canvas(icon_rep, false);
+    gfx::Canvas canvas(icon_.size(), scale, false);
+    canvas.DrawImageInt(icon_, 0, 0);
+
     if (badges_.top_left)
       canvas.DrawImageInt(*badges_.top_left, 0, 0);
     if (badges_.top_right)