Revert of Auto-generate v8 version based on tags.

Revert of Auto-generate v8 version based on tags. (patchset #5 id:80001 of https://codereview.chromium.org/797503007/)

Reason for revert:
Blocks roll on android_aosp:
https://codereview.chromium.org/851953005/

Original issue's description:
> Auto-generate v8 version based on tags.
>
> BUG=chromium:446166
> LOG=y
>
> Committed: https://crrev.com/b301b85be895c6fcd1edfe2fd1e60b5abd0ac64d
> Cr-Commit-Position: refs/heads/master@{#26062}

TBR=jochen@chromium.org,jkummerow@chromium.org,tandrii@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=chromium:446166
Committed: https://crrev.com/28d99ef77f33d52f78f64cd2a7ba2c0049023ec9
Cr-Commit-Position: refs/heads/master@{#26067}

[Michael Achenbach, 2015-01-15 08:00:23]

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

[commit-bot: I haz the power, 2015-01-15 08:00:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/850263002/1

[commit-bot: I haz the power, 2015-01-15 08:01:11]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-15 08:01:21]

Patchset 1 (id:??) landed as
https://crrev.com/28d99ef77f33d52f78f64cd2a7ba2c0049023ec9
Cr-Commit-Position: refs/heads/master@{#26067}

[Jakob Kummerow, 2015-01-15 08:05:06]

rubberstamp LGTM

[Michael Achenbach, 2015-01-15 08:37:36]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/848913003/ by machenbach@chromium.org.

The reason for reverting is: Repairing aosp..