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

Review URL: https://codereview.chromium.org/855263002

Cr-Commit-Position: refs/heads/master@{#26121}