Add context_utils.h includes where needed.

media/midi/midi_manager_android.cc

 // Copyright 2014 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 "media/midi/midi_manager_android.h"
 
 #include "base/android/build_info.h"
+#include "base/android/context_utils.h"
 #include "base/command_line.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
 #include "jni/MidiManagerAndroid_jni.h"
 #include "media/midi/midi_device_android.h"
 #include "media/midi/midi_manager_usb.h"
 #include "media/midi/midi_output_port_android.h"
 #include "media/midi/midi_switches.h"
 #include "media/midi/usb_midi_device_factory_android.h"
 
@@ skipping 139 matching lines @@
   }
   devices_.push_back(device.release());
 }
 
 bool MidiManagerAndroid::Register(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace midi
 }  // namespace media