Fix transparent avatar icons.

My previous CL https://codereview.chromium.org/678553002/ did not handle this
case correctly.

BUG=412383

Review URL: https://codereview.chromium.org/686353002

Cr-Commit-Position: refs/heads/master@{#302443}

chrome/browser/ui/views/profiles/avatar_menu_button.cc

@@ -123,6 +123,17 @@ void AvatarMenuButton::GetAvatarImages(Profile* profile,
 
     if (switches::IsNewAvatarMenu()) {
       *avatar = cache.GetAvatarIconOfProfileAtIndex(index);
+      // TODO(noms): Once the code for the old avatar menu button is removed,
+      // this function will only be called for badging the taskbar icon.  The
+      // function can be renamed to something like GetAvatarImageForBadging()
+      // and only needs to return the avatar from
+      // AvatarMenu::GetImageForMenuButton().
+#if !defined(OS_CHROMEOS)
+      bool is_badge_rectangle = false;
+      AvatarMenu::GetImageForMenuButton(profile,
+                                        taskbar_badge_avatar,
+                                        &is_badge_rectangle);
+#endif
     } else {
       AvatarMenu::GetImageForMenuButton(profile, avatar, is_rectangle);
     }