Fix: UndoManager#saveInstanceState.

The number of redo states was stored to Parcel in saveInstanceState;
however, there wasn't corresponding read in restoreInstanceState.

Bug: 29113655
Change-Id: I95298f43dd206e0318a80f1643d2129d1199cc9e

core/java/android/content/UndoManager.java

@@ -142,7 +142,6 @@ public class UndoManager {
             mUndos.get(i).writeToParcel(p);
         }
         i = mRedos.size();
-        p.writeInt(i);
         while (i > 0) {
             p.writeInt(2);
             i--;