Remove unused gfx::Image constructor which takes in ImageSkiaRep

ui/gfx/image/image.h

Index: ui/gfx/image/image.h
diff --git a/ui/gfx/image/image.h b/ui/gfx/image/image.h
index 079014803a850d21a83672d73d4ddc300ea79843..999e397c6176a863002a30430f80e1c63651e471 100644
--- a/ui/gfx/image/image.h
+++ b/ui/gfx/image/image.h
@@ -37,7 +37,6 @@ class ImageMacTest;
 
 namespace gfx {
 class ImageSkia;
-class ImageSkiaRep;
 
 #if defined(TOOLKIT_GTK)
 class CairoCachedSurface;
@@ -73,10 +72,6 @@ class UI_EXPORT Image {
   // representation.
   explicit Image(const ImageSkia& image);
 
-  // Creates a new image by copying the image rep for use as the default
-  // representation.
-  explicit Image(const ImageSkiaRep& image_rep);
-
   // Creates a new image by copying the bitmap for use as the default
   // representation.
   // TODO(pkotwicz): Get rid of this constructor.