Move video send/receive stream headers to webrtc/call.

webrtc/media/base/videosourceinterface.cc

Index: webrtc/media/base/videosourceinterface.cc
diff --git a/webrtc/media/base/videosourceinterface.cc b/webrtc/media/base/videosourceinterface.cc
new file mode 100644
index 0000000000000000000000000000000000000000..2c69da3ccaf1d904c9abeffae96942e3a37e1f2b
--- /dev/null
+++ b/webrtc/media/base/videosourceinterface.cc
@@ -0,0 +1,17 @@
+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/media/base/videosourceinterface.h"
+namespace rtc {
+
+VideoSinkWants::VideoSinkWants() = default;
+VideoSinkWants::~VideoSinkWants() = default;
+
+}  // namespace rtc