Fix a problem when a WebFrame is reloaded while the camera is being started.


BUG=157779
TEST= new unit test in media_stream_impl_unittest


Review URL: https://chromiumcodereview.appspot.com/11272027

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@164378 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed