Remove onError from translationResultCallback.

*onError is not needed, error code is embedded in the
TranslationResponse itself.

Bug: 176208267
Test: atest CtsTranslationTestCases
Change-Id: I67f42ae900cbac1d697de7ecae1bbffabd921c4a

core/api/system-current.txt

@@ -10323,7 +10323,7 @@ package android.service.translation {
   }
 
   public static interface TranslationService.OnTranslationResultCallback {
-    method public void onError();
+    method @Deprecated public void onError();
     method public void onTranslationSuccess(@NonNull android.view.translation.TranslationResponse);
   }
 

core/java/android/service/translation/ITranslationCallback.aidl

@@ -25,5 +25,4 @@ import android.view.translation.TranslationResponse;
  */
 oneway interface ITranslationCallback {
     void onTranslationResponse(in TranslationResponse translationResponse);
-    void onError();
 }

core/java/android/service/translation/OnTranslationResultCallbackWrapper.java

@@ -66,22 +66,13 @@ final class OnTranslationResultCallbackWrapper implements
         }
     }
 
+    /**
+     * @deprecated use {@link #onTranslationSuccess} with error response instead.
+     */
     @Override
+    @Deprecated
     public void onError() {
-        assertNotCalled();
-        if (mCalled.getAndSet(true)) {
-            throw new IllegalStateException("Already called");
-        }
-
-        try {
-            mCallback.onError();
-        } catch (RemoteException e) {
-            if (e instanceof DeadObjectException) {
-                Log.w(TAG, "Process is dead, ignore.");
-                return;
-            }
-            throw e.rethrowAsRuntimeException();
-        }
+        // no-op.
     }
 
     private void assertNotCalled() {

core/java/android/service/translation/TranslationService.java

@@ -140,7 +140,9 @@ public abstract class TranslationService extends Service {
 
         /**
          * TODO: implement javadoc
+         * @deprecated use {@link #onTranslationSuccess} with an error response instead.
          */
+        @Deprecated
         void onError();
     }
 

core/java/android/view/translation/Translator.java

@@ -329,24 +329,5 @@ public class Translator {
                 }
             }
         }
-
-        @Override
-        public void onError() throws RemoteException {
-            final Consumer<TranslationResponse>  callback = mCallback.get();
-            final Runnable runnable = () -> callback.accept(
-                    new TranslationResponse.Builder(
-                            TranslationResponse.TRANSLATION_STATUS_UNKNOWN_ERROR)
-                            .build());
-
-            if (callback != null) {
-                final Executor executor = mExecutor.get();
-                final long token = Binder.clearCallingIdentity();
-                try {
-                    executor.execute(runnable);
-                } finally {
-                    restoreCallingIdentity(token);
-                }
-            }
-        }
     }
 }