GitLab

Cronet isn't covered by the CQ and broke when we removed
RegisterNativesImpl for classes that don't need it. Fix up by removing
the corresponding parts for use_platform_icu_alternatives=true which is
only used by cronet.

BUG=603936

Review-Url: https://codereview.chromium.org/2215863002
Cr-Commit-Position: refs/heads/master@{#409867}