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Previously, only insecure origin use of getUserMedia was counted with
RAPPOR. This adds RAPPOR counts for secure origin use. Additionally,
this updates the Promise version of the API (still behind a flag) to use
all the counts as well.

Review URL: https://codereview.chromium.org/1307663003

git-svn-id: svn://svn.chromium.org/blink/trunk@201433 bbb929c8-8fbe-4397-9dbb-9b2b20218538