Fix IOSChromeSyncClient to support syncer::TYPED_URLS.
Fix IOSChromeSyncClient to support syncer::TYPED_URLS.

The issue http://crrev.com/1454503002 added support for TYPED_URLS
to desktop ChromeSyncClient but missed IOSChromeSyncClient. Fix the
omission to avoid a DCHECK downstream.

BUG=562170,570296,570297

Review URL: https://codereview.chromium.org/1530123003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#365532}

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