Add missing final and @GuardedBy

This is a follow up CL to my previous CL [1], where I forgot to add
final and @GuardedBy to InputMethodManagerService#mStartInputMap.

 [1]: I9921b381e02106dbffff5e0b3d13f0a1245ce807
      6db3bfe3

Test: Compile
Bug: 35079353
Change-Id: I29897752e16573a27bf700b1d822889789c35292

parent 27b35add

services/core/java/com/android/server/InputMethodManagerService.java

+2 −1

Original line number	Diff line number	Diff line
		@@ -536,7 +536,8 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
		}
		}

		private WeakHashMap<IBinder, StartInputInfo> mStartInputMap = new WeakHashMap<>();
		@GuardedBy("mMethodMap")
		private final WeakHashMap<IBinder, StartInputInfo> mStartInputMap = new WeakHashMap<>();

		class SettingsObserver extends ContentObserver {
		int mUserId;