Tidy up UserMediaController references from mediastream request objects.

References to the UserMediaController GCed object need to be traced;
add missing Member<> refs + trace over these.

R=haraken
BUG=340522

Review URL: https://codereview.chromium.org/791033003

git-svn-id: svn://svn.chromium.org/blink/trunk@186932 bbb929c8-8fbe-4397-9dbb-9b2b20218538
5 files changed
tree: 241921d08cd2bd43b118c61822bc9aaf850b3316
  1. third_party/