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Compiling cronet requires particular flags and it is advised to use the
helper script components/cronet/tools/cr_cronet.py to prepare the build
so add a gn flag to control whether cronet is build on iOS.

Due to the specific flags, the compilation of cronet is sometimes broken
on the downstream iOS bots causing unnecessary churn as cronet is unused
by Chrome on iOS.

BUG=640686

Review-Url: https://codereview.chromium.org/2312963002
Cr-Commit-Position: refs/heads/master@{#417301}