Remove @UnsupportedAppUsage from EditableInputConnection

As described in the previous CL [1], there are alternatives for app
deverlopers who somehow had to directly rely on
EditableInputConnection.

 [1]: I0c879645a84fde14dd6444bb4735f543457e43a8

Fix: 192969370
Test: atest CtsInputMethodTestCases
Change-Id: I6b60f52dfea99c262fddbc5f3d87d6f0967ae8e7

core/java/com/android/internal/widget/EditableInputConnection.java

@@ -22,7 +22,6 @@ import static android.view.inputmethod.InputConnectionProto.SELECTED_TEXT;
 import static android.view.inputmethod.InputConnectionProto.SELECTED_TEXT_END;
 import static android.view.inputmethod.InputConnectionProto.SELECTED_TEXT_START;
 
-import android.compat.annotation.UnsupportedAppUsage;
 import android.os.Bundle;
 import android.text.Editable;
 import android.text.Selection;
@@ -55,10 +54,6 @@ public class EditableInputConnection extends BaseInputConnection
     // A negative value means that this connection has been finished by the InputMethodManager.
     private int mBatchEditNesting;
 
-    @UnsupportedAppUsage(trackingBug = 192969370,
-            publicAlternatives = "Use {@link android.view.inputmethod.InputConnectionWrapper} to "
-                    + "intercept method calls. Or directly implement "
-                    + "{@link android.view.inputmethod.InputConnection} for your own editor.")
     public EditableInputConnection(TextView textview) {
         super(textview, true);
         mTextView = textview;