Revert of GetTimeToCallback() returns estimated time to callback. (patchset #5 id:80001 of https://codereview.chromium.org/2557663002/ )

Reason for revert:
Removing Timer::GetTimeToCallback() as discussed post commit on CL introducing it.

Original issue's description:
> GetTimeToCallback() returns estimated time to callback.
>
> BUG=none
> TEST=unit tests
>
> Committed: https://crrev.com/ceb6d93b695b137481f050f5b967d882a77b7398
> Cr-Commit-Position: refs/heads/master@{#439174}

TBR=mark@chromium.org,drcrash@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=none

Review-Url: https://codereview.chromium.org/2621663002
Cr-Commit-Position: refs/heads/master@{#442290}


CrOS-Libchrome-Original-Commit: f115664eb4b48daa35590c365d7db577f3514c0c
3 files changed
tree: 5b6ff9f1ed8a742d28b7c531df3413810c4b85ff
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/