Remove now-unnecessary .obj() in Java method calls.

mojo/android/javatests/validation_test_util.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/android/javatests/validation_test_util.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/android/jni_android.h"
@@ skipping 19 matching lines @@
     const JavaParamRef<jstring>& data_as_string) {
   std::string input =
       base::android::ConvertJavaStringToUTF8(env, data_as_string);
   std::vector<uint8_t> data;
   size_t num_handles;
   std::string error_message;
   if (!test::ParseValidationTestInput(
           input, &data, &num_handles, &error_message)) {
     ScopedJavaLocalRef<jstring> j_error_message =
         base::android::ConvertUTF8ToJavaString(env, error_message);
-    return Java_ValidationTestUtil_buildData(env, nullptr, 0,
-                                             j_error_message.obj());
+    return Java_ValidationTestUtil_buildData(env, nullptr, 0, j_error_message);
   }
   void* data_ptr = &data[0];
   if (!data_ptr) {
     DCHECK(!data.size());
     data_ptr = &data;
   }
   jobject byte_buffer =
       env->NewDirectByteBuffer(data_ptr, data.size());
   return Java_ValidationTestUtil_buildData(env, byte_buffer, num_handles,
                                            nullptr);
 }
 
 }  // namespace android
 }  // namespace mojo