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On Macbook Air 2013, letting this be default results in a keyframe every ~5
seconds. This is too often for some applications. This CL changes this limit
so that max keyframe interval is 4 minutes.

BUG=658429
TEST=AppRTC loopback on Mac.

Review-Url: https://codereview.chromium.org/2431223011
Cr-Commit-Position: refs/heads/master@{#427143}