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Also convert ios/chrome/browser/ui/sync:eg_tests to ARC, since this
simplifies use of output parameters in sync_test_util.mm.

Automatically generated ARCMigrate commit
Notable issues:None
BUG=624363
TEST=None

Review-Url: https://codereview.chromium.org/2888173002
Cr-Commit-Position: refs/heads/master@{#478845}