Make removeImeSurfaceFromWindow to one-way

We introduced IVoidResultCallback mechanism to
removeImeSurfaceFromWindow in CL[1] to simulate
two-way behavior before it become truly one-way.

InputMethodManagerService#removeImeSurfaceFromWindow()
simply post the task into its message queue hence we
should able to safely convert this method into one-way.

-. Remove IVoidResultCallback for this method
-. Rename it to removeImeSurfaceFromWindowAsync

[1]: Icb396ae5d74060af69c4ecb16723b2e37b9f2067

Bug: 179668859
Bug: 185277968
Test: Manual test with b/179668859 steps, and works fine
Test: atest CtsInputMethodTestCases
Change-Id: Id28698e263a23ec4a6e4f89438eba5d19bbbabbb

core/java/android/view/inputmethod/InputMethodManager.java

@@ -2230,9 +2230,7 @@ public final class InputMethodManager {
     public void removeImeSurface(IBinder windowToken) {
         synchronized (mH) {
             try {
-                final Completable.Void value = Completable.createVoid();
-                mService.removeImeSurfaceFromWindow(windowToken, ResultCallbacks.of(value));
-                Completable.getResult(value);
+                mService.removeImeSurfaceFromWindowAsync(windowToken);
             } catch (RemoteException e) {
                 throw e.rethrowFromSystemServer();
             }

core/java/com/android/internal/view/IInputMethodManager.aidl

@@ -89,8 +89,7 @@ interface IInputMethodManager {
     /** Remove the IME surface. Requires INTERNAL_SYSTEM_WINDOW permission. */
     oneway void removeImeSurface(in IVoidResultCallback resultCallback);
     /** Remove the IME surface. Requires passing the currently focused window. */
-    oneway void removeImeSurfaceFromWindow(in IBinder windowToken,
-            in IVoidResultCallback resultCallback);
+    oneway void removeImeSurfaceFromWindowAsync(in IBinder windowToken);
     oneway void startProtoDump(in byte[] protoDump, int source, String where,
             in IVoidResultCallback resultCallback);
     oneway void isImeTraceEnabled(in IBooleanResultCallback resultCallback);

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

@@ -4100,13 +4100,10 @@ public class InputMethodManagerService extends IInputMethodManager.Stub
     }
 
     @Override
-    public void removeImeSurfaceFromWindow(IBinder windowToken,
-            IVoidResultCallback resultCallback) {
-        CallbackUtils.onResult(resultCallback, () -> {
-            // No permission check, because we'll only execute the request if the calling window is
-            // also the current IME client.
-            mHandler.obtainMessage(MSG_REMOVE_IME_SURFACE_FROM_WINDOW, windowToken).sendToTarget();
-        });
+    public void removeImeSurfaceFromWindowAsync(IBinder windowToken) {
+        // No permission check, because we'll only execute the request if the calling window is
+        // also the current IME client.
+        mHandler.obtainMessage(MSG_REMOVE_IME_SURFACE_FROM_WINDOW, windowToken).sendToTarget();
     }
 
     /**

services/core/java/com/android/server/inputmethod/MultiClientInputMethodManagerService.java

@@ -1510,10 +1510,8 @@ public final class MultiClientInputMethodManagerService {
 
         @BinderThread
         @Override
-        public void removeImeSurfaceFromWindow(IBinder windowToken,
-                IVoidResultCallback resultCallback) {
+        public void removeImeSurfaceFromWindowAsync(IBinder windowToken) {
             reportNotSupported();
-            CallbackUtils.onResult(resultCallback, () -> { });
         }
 
         @BinderThread