Revert of Make instrumentation test dependency on a support APK explicit

Revert of Make instrumentation test dependency on a support APK explicit (patchset #8 id:130001 of https://codereview.chromium.org/1208483004/)

Reason for revert:
Cast tests failing on ToT after this.

Original issue's description:
> Make instrumentation test dependency on a support APK explicit
>
> Add an argument (support_apk_name) to the GYP and GN
> instrumentation_test_apk targets to provide a support APK. The
> argument is optional, but when present, the build will fail if the
> APK is not installable
>
> BUG=501797
>
> Committed: https://crrev.com/0ac9fec88bf9a042410192b304ae1bc252df8aa7
> Cr-Commit-Position: refs/heads/master@{#339046}

TBR=jbudorick@chromium.org,cjhopman@chromium.org,dgn@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=501797
Committed: https://crrev.com/72c598c090ae4f8df7c55bae7acc8dfea46ba0c6
Cr-Commit-Position: refs/heads/master@{#339170}

[Yusuf, 2015-07-16 23:32:27]

Created Revert of Make instrumentation test dependency on a support APK explicit

[commit-bot: I haz the power, 2015-07-16 23:35:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1237983004/1

[commit-bot: I haz the power, 2015-07-16 23:40:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-07-16 23:41:33]

Patchset 1 (id:??) landed as
https://crrev.com/72c598c090ae4f8df7c55bae7acc8dfea46ba0c6
Cr-Commit-Position: refs/heads/master@{#339170}