Remove abandoned implementation.

To prevent accidental ressurection via manifest errors.

Change-Id: I269dc248c2cb5e4bfdcb38334962070f1aba339e

proguard-release.flags

@@ -1,26 +0,0 @@
-#  Copyright (C) 2015 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.
-
--keep class com.android.messaging.ui.contact.* { *; }
-
--assumenosideeffects public class com.android.messaging.util.Trace {
-    public void beginSection(...);
-    public void endSection(...);
-}
--assumenosideeffects public class com.android.messaging.util.Assert {
-    private void setIfEngBuild();
-}
--assumenosideeffects public class com.android.messaging.util.DebugUtils {
-    public void logCurrentMethod(...);
-}