Add context_utils.h includes where needed.

content/browser/media/android/media_throttler.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 "content/browser/media/android/media_throttler.h"
 
+#include "base/android/context_utils.h"
 #include "base/android/jni_android.h"
 #include "jni/MediaThrottler_jni.h"
 
 namespace content {
 
 // static
 MediaThrottler* MediaThrottler::GetInstance() {
   return base::Singleton<MediaThrottler>::get();
 }
 
@@ skipping 22 matching lines @@
 
 MediaThrottler::MediaThrottler() {
   JNIEnv* env = base::android::AttachCurrentThread();
   CHECK(env);
 
   j_media_throttler_.Reset(Java_MediaThrottler_create(
       env, base::android::GetApplicationContext()));
 }
 
 }  // namespace content