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This aligns the name with the native SyncService.

Also rename SyncTestUtil.isSyncActive()/waitForSyncActive() to
isSyncFeatureActive()/waitForSyncFeatureActive() for consistency.

Bug: 985290
Change-Id: I6383e8bd6bdf3b0767fdd7f5e3c3c4b49292d82d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2644938
Commit-Queue: Marc Treib <treib@chromium.org>
Reviewed-by: Victor Vianna <victorvianna@google.com>
Cr-Commit-Position: refs/heads/master@{#846133}