Replace launcher3 default icon to match with the platform one.
Bug: 63083094

Change-Id: Ic77d443ee563959c2569263e2d9de7452fa8d26d
diff --git a/src/com/android/launcher3/IconCache.java b/src/com/android/launcher3/IconCache.java
index 5e06763..a23a674 100644
--- a/src/com/android/launcher3/IconCache.java
+++ b/src/com/android/launcher3/IconCache.java
@@ -120,7 +120,7 @@
     }
 
     private Drawable getFullResDefaultActivityIcon() {
-        return getFullResIcon(Resources.getSystem(), android.R.mipmap.sym_def_app_icon);
+        return getFullResIcon(Resources.getSystem(), android.R.drawable.sym_def_app_icon);
     }
 
     private Drawable getFullResIcon(Resources resources, int iconId) {