Add @UnsupportedAppUsage annotations

For packages:
  android.webkit

This is an automatically generated CL. See go/UnsupportedAppUsage
for more details.

Exempted-From-Owner-Approval: Mechanical changes to the codebase
which have been approved by Android API council and announced on
android-eng@

Bug: 110868826
Test: m
Change-Id: Ic22415d3e70a3b75a6418f96beb371d0445c7484
Merged-In: I41643e1e47391a12b0aed3058b3d9987a8e6ee2f
diff --git a/core/java/android/webkit/JsResult.java b/core/java/android/webkit/JsResult.java
index d36ab418..5bf6aab 100644
--- a/core/java/android/webkit/JsResult.java
+++ b/core/java/android/webkit/JsResult.java
@@ -17,6 +17,7 @@
 package android.webkit;
 
 import android.annotation.SystemApi;
+import android.annotation.UnsupportedAppUsage;
 
 /**
  * An instance of this class is passed as a parameter in various {@link WebChromeClient} action
@@ -34,6 +35,7 @@
         public void onJsResultComplete(JsResult result);
     }
     // This is the caller of the prompt and is the object that is waiting.
+    @UnsupportedAppUsage
     private final ResultReceiver mReceiver;
     // This is a basic result of a confirm or prompt dialog.
     private boolean mResult;