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Suspicious root cause of the last revert was fixed. See crbug.com/670638.
Description from https://crrev.com/dc8303234f47ccfc841185d33c45e4852776b65e:

This CL introduces adaptive webfont display behavior, reducing unnecessary Flash
of Unstyled Text (FOUT) if webfont is already available in disk cache.  This is
available as a experimental Web Platform feature.

In webfont display, fallback font will be used if webfont loading time exceeds
certain timeout values in slow network. However it's observed that disk cache
RTT may also hit the timeout regardless of network speed. In such cases we would
like to block display until disk cache misses and actual network request is
being sent.

BUG=570205
TBR=isherman@chromium.org

Review-Url: https://codereview.chromium.org/2556683003
Cr-Commit-Position: refs/heads/master@{#437522}