Revert of Instrumented libraries: add a target for pre-built libraries.

Revert of Instrumented libraries: add a target for pre-built libraries. (patchset #2 id:20001 of https://codereview.chromium.org/1017053003/)

Reason for revert:
Broke tree.

Original issue's description:
> Instrumented libraries: add a target for pre-built libraries.
>
> With use_prebuilt_instrumented_libraries=1 in GYP_DEFINES, binaries are now
> unpacked from archive and placed into output dir.
>
> BUG=462636
> R=glider@chromium.org
> TBR=thakis@chromium.org
> NOTRY=true
>
> Committed: https://crrev.com/744256e2f3933feaa05c967541afac36825056fa
> Cr-Commit-Position: refs/heads/master@{#321804}

TBR=glider@chromium.org,thakis@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=462636
Committed: https://crrev.com/6b777d77c3e23bf7ccf8f4fe2aa47874a435c631
Cr-Commit-Position: refs/heads/master@{#321806}

[earthdok, 2015-03-23 17:55:08]

Created Revert of Instrumented libraries: add a target for pre-built libraries.

[commit-bot: I haz the power, 2015-03-23 17:55:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1029103003/1

[commit-bot: I haz the power, 2015-03-23 17:56:34]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-23 17:57:06]

Patchset 1 (id:??) landed as
https://crrev.com/6b777d77c3e23bf7ccf8f4fe2aa47874a435c631
Cr-Commit-Position: refs/heads/master@{#321806}