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This cl changes MediaStreamManager to internally use a list of requests instead of a map. The purpose is to make sure requests are serviced in the order they are requested rather than be dependent on the map key.
This is to avoid that the requests are serviced out of order if several requests are waiting for a media device to be opened.

BUG=381893

Review URL: https://codereview.chromium.org/345713005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278453 0039d316-1c4b-4281-b951-d872f2087c98