jni: Forbid inappropriate JNI parameter conversions.

chrome/browser/android/feedback/connectivity_checker.cc

 // Copyright 2015 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 "chrome/browser/android/feedback/connectivity_checker.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 165 matching lines @@
   }
   GURL url(base::android::ConvertJavaStringToUTF8(env, j_url));
   if (!url.is_valid()) {
     PostCallback(env, j_callback, CONNECTIVITY_CHECK_RESULT_ERROR);
     return;
   }
 
   // This object will be deleted when the connectivity check has completed.
   ConnectivityChecker* connectivity_checker = new ConnectivityChecker(
       profile, url, base::TimeDelta::FromMilliseconds(j_timeout_ms),
-      base::android::ScopedJavaLocalRef<jobject>(env, j_callback));
+      j_callback);
   connectivity_checker->StartAsyncCheck();
 }
 
 jboolean IsUrlValid(JNIEnv* env,
                     const JavaParamRef<jclass>& clazz,
                     const JavaParamRef<jstring>& j_url) {
   GURL url(base::android::ConvertJavaStringToUTF8(env, j_url));
   return url.is_valid();
 }
 
 bool RegisterConnectivityChecker(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android
 }  // namespace chrome