chromeos: Use gfx::ImageSkia instead of SkBitmap for downloaded profile image.

chrome/browser/chromeos/login/user_manager.h

Index: chrome/browser/chromeos/login/user_manager.h
diff --git a/chrome/browser/chromeos/login/user_manager.h b/chrome/browser/chromeos/login/user_manager.h
index c53e43d92e5a801dee6c108060841f5411149764..454d3586e31332213da4a89f2c1aed6d44f19072 100644
--- a/chrome/browser/chromeos/login/user_manager.h
+++ b/chrome/browser/chromeos/login/user_manager.h
@@ -13,10 +13,13 @@
 #include "chrome/browser/chromeos/login/user.h"
 #include "chrome/browser/ui/webui/options2/chromeos/set_wallpaper_options_handler.h"
 
-class SkBitmap;
 class FilePath;
 class PrefService;
 
+namespace gfx {
+class ImageSkia;
+}
+
 namespace chromeos {
 
 class RemoveUserDelegate;
@@ -237,7 +240,7 @@ class UserManager {
 
   // Returns the result of the last successful profile image download, if any.
   // Otherwise, returns an empty bitmap.
-  virtual const SkBitmap& DownloadedProfileImage() const = 0;
+  virtual const gfx::ImageSkia& DownloadedProfileImage() const = 0;
 };
 
 }  // namespace chromeos