Revert "Resolve session linger caused by RemoteFillService."

This reverts commit 58e1c93c.

Reason for revert: b/306964891.
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:29d48b546d4118caec3cbce0eee528ad6cb5a6ed)
Merged-In: I09f6c9d3570aed0f94385b46f7103e836693e502
Change-Id: I09f6c9d3570aed0f94385b46f7103e836693e502

services/autofill/java/com/android/server/autofill/RemoteFillService.java

@@ -56,7 +56,7 @@ final class RemoteFillService extends ServiceConnector.Impl<IAutoFillService> {
     private static final long TIMEOUT_IDLE_BIND_MILLIS = 5 * DateUtils.SECOND_IN_MILLIS;
     private static final long TIMEOUT_REMOTE_REQUEST_MILLIS = 5 * DateUtils.SECOND_IN_MILLIS;
 
-    private FillServiceCallbacks mCallbacks;
+    private final FillServiceCallbacks mCallbacks;
     private final Object mLock = new Object();
     private CompletableFuture<FillResponse> mPendingFillRequest;
     private int mPendingFillRequestId = INVALID_REQUEST_ID;
@@ -128,12 +128,9 @@ final class RemoteFillService extends ServiceConnector.Impl<IAutoFillService> {
      */
     public int cancelCurrentRequest() {
         synchronized (mLock) {
-            int canceledRequestId = mPendingFillRequest != null && mPendingFillRequest.cancel(false)
+            return mPendingFillRequest != null && mPendingFillRequest.cancel(false)
                     ? mPendingFillRequestId
                     : INVALID_REQUEST_ID;
-            mPendingFillRequest = null;
-            mPendingFillRequestId = INVALID_REQUEST_ID;
-            return canceledRequestId;
         }
     }
 
@@ -187,10 +184,6 @@ final class RemoteFillService extends ServiceConnector.Impl<IAutoFillService> {
                 mPendingFillRequest = null;
                 mPendingFillRequestId = INVALID_REQUEST_ID;
             }
-            if (mCallbacks == null) {
-                Slog.w(TAG, "Error calling RemoteFillService - service already unbound");
-                return;
-            }
             if (err == null) {
                 mCallbacks.onFillRequestSuccess(request.getId(), res,
                         mComponentName.getPackageName(), request.getFlags());
@@ -227,10 +220,6 @@ final class RemoteFillService extends ServiceConnector.Impl<IAutoFillService> {
             return save;
         }).orTimeout(TIMEOUT_REMOTE_REQUEST_MILLIS, TimeUnit.MILLISECONDS)
                 .whenComplete((res, err) -> Handler.getMain().post(() -> {
-                    if (mCallbacks == null) {
-                        Slog.w(TAG, "Error calling RemoteFillService - service already unbound");
-                        return;
-                    }
                     if (err == null) {
                         mCallbacks.onSaveRequestSuccess(mComponentName.getPackageName(), res);
                     } else {
@@ -245,8 +234,6 @@ final class RemoteFillService extends ServiceConnector.Impl<IAutoFillService> {
     }
 
     public void destroy() {
-        cancelCurrentRequest();
         unbind();
-        mCallbacks = null;
     }
 }