Move gaia::AccountTracker into //components/gcm_driver

This class is deprecated and slated for removal. It now has only one
remaining consumer. This CL moves it into the directory of that consumer,
with followup merging it into the code of that consumer.

This CL also excludes AccountTracker and GCMAccountTracker from the
build on Android, as they're not used on that platform.

Bug: 729590, 809923
Change-Id: I225edf86a3af293779a8cc231ffffac711f22246
Reviewed-on: https://chromium-review.googlesource.com/1002845
Commit-Queue: Colin Blundell <blundell@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Mihai Sardarescu <msarda@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#551904}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 021e3e4d708a695a7714daf1eae89cbfa4a07708
4 files changed