Add missing using statements for JNI types.

chrome/browser/android/feedback/screenshot_task.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/screenshot_task.h"
 
 #include <stddef.h>
 
 #include "base/android/scoped_java_ref.h"
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "jni/ScreenshotTask_jni.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/android/window_android.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/snapshot/snapshot.h"
 
 using base::android::AttachCurrentThread;
+using base::android::JavaParamRef;
 using base::android::ScopedJavaGlobalRef;
 using ui::WindowAndroid;
 
 namespace chrome {
 namespace android {
 
 bool RegisterScreenshotTask(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
@@ skipping 25 matching lines @@
       window_bounds,
       base::ThreadTaskRunnerHandle::Get(),
       base::Bind(&SnapshotCallback,
                  env,
                  base::Owned(new ScopedJavaGlobalRef<jobject>(env,
                                                               jcallback))));
 }
 
 }  // namespace android
 }  // namespace chrome