Per navigation sticky media permissions.

content/public/common/media_stream_request.cc

Index: content/public/common/media_stream_request.cc
diff --git a/content/public/common/media_stream_request.cc b/content/public/common/media_stream_request.cc
index 4a4bf729fbacbf1dd93cdcf95df6372d2077329e..fa12fc8a537fa1236ea64ebe7ec6d119e2f897da 100644
--- a/content/public/common/media_stream_request.cc
+++ b/content/public/common/media_stream_request.cc
@@ -67,6 +67,22 @@ bool MediaStreamDevice::IsEqual(const MediaStreamDevice& second) const {
       input.channel_layout == input_second.channel_layout;
 }
 
+MediaStreamDevices::MediaStreamDevices() {}
+
+MediaStreamDevices::MediaStreamDevices(size_t count,
+                                       const MediaStreamDevice& value)
+    : std::vector<MediaStreamDevice>(count, value) {
+}
+
+const MediaStreamDevice* MediaStreamDevices::FindById(
+    const std::string& device_id) const {
+  for (const_iterator iter = begin(); iter != end(); ++iter) {
+    if (iter->id == device_id)
+      return &(*iter);
+  }
+  return NULL;
+}
+
 MediaStreamRequest::MediaStreamRequest(
     int render_process_id,
     int render_view_id,