Remove deprecated at birth DiagnosticCall class.

This was left in place for Google3 compatibility during development; this
is no longer required as the usages have been cleaned up.

Test: Build / run CTS
Fixes: 186659702
Change-Id: Ib386c3f9912870b11b1a37863dccfa9d3b5cb7a9

core/api/system-current.txt

@@ -10712,10 +10712,6 @@ package android.telecom {
     method public final void addExistingConnection(@NonNull android.telecom.PhoneAccountHandle, @NonNull android.telecom.Connection, @NonNull android.telecom.Conference);
   }
 
-  @Deprecated public abstract class DiagnosticCall extends android.telecom.CallDiagnostics {
-    ctor @Deprecated public DiagnosticCall();
-  }
-
   public abstract class InCallService extends android.app.Service {
     method @Deprecated public android.telecom.Phone getPhone();
     method @Deprecated public void onPhoneCreated(android.telecom.Phone);

telecomm/java/android/telecom/DiagnosticCall.java

@@ -1,27 +0,0 @@
-/*
- * Copyright (C) 2021 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package android.telecom;
-
-import android.annotation.SystemApi;
-
-/**
- * @deprecated use {@link CallDiagnostics} instead.
- * @hide
- */
-@SystemApi
-public abstract class DiagnosticCall extends CallDiagnostics {
-}