jni: Forbid inappropriate JNI parameter conversions.

content/shell/android/shell_manager.cc

 // Copyright (c) 2012 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 "content/shell/android/shell_manager.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/bind.h"
@@ skipping 34 matching lines @@
 }
 
 // Register native methods
 bool RegisterShellManager(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 static void Init(JNIEnv* env,
                  const JavaParamRef<jclass>& clazz,
                  const JavaParamRef<jobject>& obj) {
-  g_global_state.Get().j_shell_manager.Reset(
-      base::android::ScopedJavaLocalRef<jobject>(env, obj));
+  g_global_state.Get().j_shell_manager.Reset(obj);
 }
 
 void LaunchShell(JNIEnv* env,
                  const JavaParamRef<jclass>& clazz,
                  const JavaParamRef<jstring>& jurl) {
   ShellBrowserContext* browserContext =
       ShellContentBrowserClient::Get()->browser_context();
   GURL url(base::android::ConvertJavaStringToUTF8(env, jurl));
   Shell::CreateNewWindow(browserContext,
                          url,
                          NULL,
                          gfx::Size());
 }
 
 }  // namespace content