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Without a stamp a bulk rename could modify the Cronet API but pass through the
API static checks.  With the stamp, edits to api.txt must be done via update_api.py
which enforces the static checks.

Cq-Include-Trybots: master.tryserver.chromium.android:android_cronet_tester;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I01040c5e377bc6a0e8831c2bab30da5d460d6ae3
Reviewed-on: https://chromium-review.googlesource.com/1025644Reviewed-by: Andrei Kapishnikov <kapishnikov@chromium.org>
Commit-Queue: Paul Jensen <pauljensen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553662}