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Improve readability of WebRtcEventLogManager tests

Some helper functions in the unit test suite accepted two int-s,
instead of a PeerConnectionKey. That:
1. Made things longer, and therefore harder to read.
2. Introduced some risk of a typo, by which the wrong two int-s
   would be given.
This CL solves the problem.

Bug: 775415
Change-Id: Iaf45ce04779ff9a56dcdd00407afaf6c35b16749
Reviewed-on: https://chromium-review.googlesource.com/1153250
Commit-Queue: Elad Alon <eladalon@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580926}