Use initialized canvas to create network icons.

ui/gfx/canvas.h

Index: ui/gfx/canvas.h
diff --git a/ui/gfx/canvas.h b/ui/gfx/canvas.h
index 328292aee0c35ef7ed41a9cc2134deb5b5b496d5..2894193d5393c341201754a1aa7ca210d579ed9a 100644
--- a/ui/gfx/canvas.h
+++ b/ui/gfx/canvas.h
@@ -82,10 +82,6 @@ class GFX_EXPORT Canvas {
   // being returned.
   Canvas(const Size& size, float image_scale, bool is_opaque);
 
-  // Constructs a canvas with the size and the image_scale of the provided
-  // |image_rep|, and draws the |image_rep| into it.
-  Canvas(const ImageSkiaRep& image_rep, bool is_opaque);
-
   // Creates a Canvas backed by an |sk_canvas| with |image_scale_|.
   // |sk_canvas| is assumed to be already scaled based on |image_scale|
   // so no additional scaling is applied.