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This CL changes the policy so that the WakeLock is enabled only when an
RTCPeerConnection becomes connected.
Previously the WakeLock was enabled as soon as the RTCPeerConnection was
created. This caused problems for some users, since some sites create
peer connections that are never connected and are only closed when the
peer connection is removed.

Bug: 866200
Change-Id: I47e573f9555960c1a64a0f9834afb9d5dc048a94
Reviewed-on: https://chromium-review.googlesource.com/c/1315210Reviewed-by: Henrik Boström <hbos@chromium.org>
Reviewed-by: Harald Alvestrand <hta@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608905}