Use factory method to create VideoCaptureDeviceFactory .

media/video/capture/android/video_capture_device_factory_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/video/capture/android/video_capture_device_factory_android.h"
 
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ skipping 105 matching lines @@
                   media::Java_VideoCaptureFactory_getCaptureFormatHeight(env,
                       format.obj())),
         media::Java_VideoCaptureFactory_getCaptureFormatFramerate(env,
                                                                   format.obj()),
         pixel_format);
     capture_formats->push_back(capture_format);
     DVLOG(1) << device.name() << " " << capture_format.ToString();
   }
 }
 
+// static
+VideoCaptureDeviceFactory*
+VideoCaptureDeviceFactory::CreateVideoCaptureDeviceFactory(
+    scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
+  return new VideoCaptureDeviceFactoryAndroid();
+}
+
 }  // namespace media