Makes ImageSkia more like SkBitmap

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 71c3e177b2ab56ec4f4da9056ee9f183e0e5d5e6..da4b392bf81f87cd2715a62d0c8f110374991c4c 100644
--- a/ui/gfx/image/image.h
+++ b/ui/gfx/image/image.h
@@ -62,14 +62,14 @@ class UI_EXPORT Image {
   // Creates an empty image with no representations.
   Image();
 
+  // Creates a new image by copying the ImageSkia for use as the default
+  // representation.
+  explicit Image(const ImageSkia& image);
+
   // Creates a new image by copying the bitmap for use as the default
   // representation.
   explicit Image(const SkBitmap& bitmap);
 
-  // To create an Image that supports multiple resolutions pass a vector
-  // of bitmaps, one for each resolution.
-  explicit Image(const std::vector<const SkBitmap*>& bitmaps);
-
 #if defined(TOOLKIT_GTK)
   // Does not increase |pixbuf|'s reference count; expects to take ownership.
   explicit Image(GdkPixbuf* pixbuf);
@@ -108,6 +108,7 @@ class UI_EXPORT Image {
   // backing pixels are shared amongst all copies (a fact of each of the
   // converted representations, rather than a limitation imposed by Image) and
   // so the result should be considered immutable.
+  ImageSkia* CopyImageSkia() const;
   SkBitmap* CopySkBitmap() const;
 #if defined(TOOLKIT_GTK)
   GdkPixbuf* CopyGdkPixbuf() const;