Revert of Reland Auto-generate v8 version based on tags.

Revert of Reland Auto-generate v8 version based on tags. (patchset #1 id:1 of https://codereview.chromium.org/843913009/)

Reason for revert:
The gclient hook of v8 is not executed on this builder:

http://build.chromium.org/p/tryserver.chromium.linux/builders/android_aosp/builds/49765

Original issue's description:
> Reland Auto-generate v8 version based on tags.
>
> This relands the CL
> https://codereview.chromium.org/797503007/.
>
> It runs the version generation two times. First during
> runhooks as a fallback for recipes that loose git context
> (e.g. android_aosp). Second during compilation like in the
> original CL. In case of failures, the result from the
> runhooks call will be reused.
>
> BUG=chromium:446166
> LOG=n
>
> Committed: https://crrev.com/d3d6e38b2cba73b52bd5ed00f4441a7db3284a19
> Cr-Commit-Position: refs/heads/master@{#26120}

TBR=jochen@chromium.org,jkummerow@chromium.org,tandrii@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:446166
Committed: https://crrev.com/12adf1474d92839bd187c4cecc89a5689159575b
Cr-Commit-Position: refs/heads/master@{#26121}

[Michael Achenbach, 2015-01-18 15:42:09]

Created Revert of Reland Auto-generate v8 version based on tags.

[commit-bot: I haz the power, 2015-01-18 15:42:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/855263002/1

[commit-bot: I haz the power, 2015-01-18 15:43:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-18 15:43:28]

Patchset 1 (id:??) landed as
https://crrev.com/12adf1474d92839bd187c4cecc89a5689159575b
Cr-Commit-Position: refs/heads/master@{#26121}

[tandrii_google, 2015-01-19 10:10:00]

tandrii@google.com changed reviewers:
+ tandrii@google.com

[tandrii_google, 2015-01-19 10:10:00]

lgtm

[Michael Achenbach, 2015-01-19 10:56:26]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/861593002/ by machenbach@chromium.org.

The reason for reverting is: Next try....