Remove device enumeration, caching and monitoring from MediaStreamManager.

content/common/media/media_devices.cc

Index: content/common/media/media_devices.cc
diff --git a/content/common/media/media_devices.cc b/content/common/media/media_devices.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c4bb498a656a1438c2f2df866b22c33cda44213c
--- /dev/null
+++ b/content/common/media/media_devices.cc
@@ -0,0 +1,18 @@
+// 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 "content/common/media/media_devices.h"
+
+namespace content {
+
+MediaDeviceInfo::MediaDeviceInfo(const std::string& device_id,
+                                 const std::string& label,
+                                 const std::string& group_id)
+    : device_id(device_id), label(label), group_id(group_id) {}
+
+bool operator==(const MediaDeviceInfo& first, const MediaDeviceInfo& second) {
+  return first.device_id == second.device_id && first.label == second.label;
+}
+
+}  // namespace content