binder: Fix failing BinderSecurityTest test case

9ffa1e1 normalized server SecurityPolicy failures to emit code
INTERNAL with a uniform "Authorization future failed" message
but neglected to update a BinderSecurityTest case that asserts 
the opposite.

Author: jdcormie

binder/src/androidTest/java/io/grpc/binder/BinderSecurityTest.java

@@ -179,25 +179,24 @@ public void testServerDisallowsCalls() throws Exception {
   }
 
   @Test
-  public void testFailedFuturesPropagateOriginalException() throws Exception {
-    String errorMessage = "something went wrong";
-    IllegalStateException originalException = new IllegalStateException(errorMessage);
+  public void testFailedFuturesFailWithCodeInternal() throws Exception {
     createChannel(
         ServerSecurityPolicy.newBuilder()
             .servicePolicy(
                 "foo",
                 new AsyncSecurityPolicy() {
                   @Override
                   public ListenableFuture<Status> checkAuthorizationAsync(int uid) {
-                    return Futures.immediateFailedFuture(originalException);
+                    return Futures.immediateFailedFuture(
+                        new IllegalStateException("internal to SecurityPolicy"));
                   }
                 })
             .build(),
         SecurityPolicies.internalOnly());
     MethodDescriptor<Empty, Empty> method = methods.get("foo/method0");
 
     StatusRuntimeException sre = assertCallFailure(method, Status.INTERNAL);
-    assertThat(sre.getStatus().getDescription()).contains(errorMessage);
+    assertThat(sre.getStatus().getDescription()).isEqualTo("Authorization future failed");
   }
 
   @Test