Add missing using statements for JNI types.

content/app/android/content_main.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/app/android/content_main.h"
 
 #include <memory>
 
 #include "base/at_exit.h"
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/trace_event/trace_event.h"
 #include "content/public/app/content_main.h"
 #include "content/public/app/content_main_delegate.h"
 #include "content/public/app/content_main_runner.h"
 #include "content/public/common/content_switches.h"
 #include "jni/ContentMain_jni.h"
 
 using base::LazyInstance;
+using base::android::JavaParamRef;
 
 namespace content {
 
 namespace {
 LazyInstance<std::unique_ptr<ContentMainRunner>> g_content_runner =
     LAZY_INSTANCE_INITIALIZER;
 
 LazyInstance<std::unique_ptr<ContentMainDelegate>> g_content_main_delegate =
     LAZY_INSTANCE_INITIALIZER;
 
@@ skipping 17 matching lines @@
 void SetContentMainDelegate(ContentMainDelegate* delegate) {
   DCHECK(!g_content_main_delegate.Get().get());
   g_content_main_delegate.Get().reset(delegate);
 }
 
 bool RegisterContentMain(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace content