Bug 1372040 - Temporary showing large icons for AdaptiveIconDrawable. r=maliu

I don't want to call BitmapUtils.getBitmapFromDrawable() here for AdaptiveIconDrawable cause there might be performance impact if I create bitmap in main thread.
I'll use bug 1397174 to follow up this issue.

MozReview-Commit-ID: 64FE2MOk5g0

--HG--
extra : rebase_source : 041e0a5f9d7b4245650f5a229603818b11631b4e

mobile/android/base/java/org/mozilla/gecko/prompts/PromptListAdapter.java

@@ -121,12 +121,9 @@ public class PromptListAdapter extends ArrayAdapter<PromptListItem> {
             if (icon instanceof BitmapDrawable) {
                 Bitmap bitmap = ((BitmapDrawable) icon).getBitmap();
                 d = new BitmapDrawable(res, Bitmap.createScaledBitmap(bitmap, mIconSize, mIconSize, true));
-            } else if (icon instanceof VectorDrawable) {
-                // If it's a VectorDrawable, we don't need to scale it.
-                d = icon;
             } else {
-                // Other than that, we just use blank.
-                d = getBlankDrawable(res);
+                // FIXME: Fix scale issue for AdaptiveIconDrawable in bug 1397174
+                d = icon;
             }
 
         } else if (item.inGroup) {