Move MediaStreamTrack contentHint to separate IDL.

third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.cpp

Index: third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.cpp
diff --git a/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.cpp b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..69f7336223db662c94a0783f978cdfc7c8bf947b
--- /dev/null
+++ b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrackContentHint.cpp
@@ -0,0 +1,20 @@
+// Copyright 2016 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 "modules/mediastream/MediaStreamTrackContentHint.h"
+
+#include "modules/mediastream/MediaStreamTrack.h"
+
+namespace blink {
+
+String MediaStreamTrackContentHint::contentHint(const MediaStreamTrack& track) {
+  return track.contentHint();
+}
+
+void MediaStreamTrackContentHint::setContentHint(MediaStreamTrack& track,
+                                                 const String& hint) {
+  track.setContentHint(hint);
+}
+
+}  // namespace blink