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Revert of android: Move most hooks to target_os-specific section. (patchset #3...

Revert of android: Move most hooks to target_os-specific section. (patchset #3 id:40001 of https://codereview.chromium.org/2889323003/ )

Reason for revert:
Causes build failures.

BUG=724813

Original issue's description:
> android: Move most hooks to target_os-specific section.
>
> gclient recently learned about os-specific hooks, so let's make it so
> that only people working on android need to run the many, many
> android-specific hooks.
>
> No intended behavior change.  This depends on your gclient being
> up-to-date -- it's supposed to auto-update every time you run
> `gclient`, but that sometimes doesn't work.  If you see issues
> after this, `cd ~/src/depot_tools` and `git log` to verify
> that your depot_tools is up-to-date (if it isn't, it's probably
> easiest to delete and re-checkout depot_tools).
>
> BUG=none
>
> Review-Url: https://codereview.chromium.org/2889323003
> Cr-Commit-Position: refs/heads/master@{#473247}
> Committed: https://chromium.googlesource.com/chromium/src/+/e11217d349cd215cde35f3dde1174a149303ac9c

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

Review-Url: https://codereview.chromium.org/2900523002
Cr-Commit-Position: refs/heads/master@{#473446}