Enable all supported components on iOS.
Enable all supported components on iOS.

Those components are the one used by ios_chrome_unittests target with
gyp and thus known to work on iOS. Enable them when using gn instead
of gyp.

BUG=459705,556433

Review URL: https://codereview.chromium.org/1450873002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#360419}

axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk