Remove unused KioskAppIconLoader::LoadResult enum

Bug: 1164001
Change-Id: Ic4018a71196b0c6e0e9f616873aacaf826155cbe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2640055Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Cr-Commit-Position: refs/heads/master@{#845386}

chrome/browser/chromeos/app_mode/kiosk_app_icon_loader.h

@@ -21,12 +21,6 @@ namespace chromeos {
 // Loads locally stored icon data and decodes it.
 class KioskAppIconLoader {
  public:
-  enum LoadResult {
-    SUCCESS,
-    FAILED_TO_LOAD,
-    FAILED_TO_DECODE,
-  };
-
   class Delegate {
    public:
     virtual void OnIconLoadSuccess(const gfx::ImageSkia& icon) = 0;