[getUserMedia] Address old comments by folding initialization.

BUG=736309
TESTED=ninja -C out/Default/ content_unittests && ./out/Default/content_unittests
R=guidou@chromium.org

Change-Id: I838b68b20ed81a088312a4b0fd0f4527ada9b3b7
Reviewed-on: https://chromium-review.googlesource.com/c/1373817
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Armando Miraglia <armax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615887}
1 file changed