Revert of Enabled chrome_proxy benchmarks on Android as we now have a TryBot.

Revert of Enabled chrome_proxy benchmarks on Android as we now have a TryBot. (https://codereview.chromium.org/367753003/)

Reason for revert:
chrome_proxy tests need live server access. Android chromium.perf bots don't have access to live servers and all tests under tools/perf are now part of chromium.perf. 

It seems chrome_proxy trybot for now can use flag --also-run-disabled-tests to explicitly run these tests.

Original issue's description:
> Enabled chrome_proxy benchmarks on Android as we now have a TryBot.
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=281182

TBR=tonyg@chromium.org,dtu@chromium.org
NOTREECHECKS=true
NOTRY=true

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=282123

[bolian, 2014-07-09 19:17:33]

Created Revert of Enabled chrome_proxy benchmarks on Android as we now have a
TryBot.

[commit-bot: I haz the power, 2014-07-09 19:21:05]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/bolian@chromium.org/379233003/1

[commit-bot: I haz the power, 2014-07-09 19:21:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-07-09 19:21:07]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[tonyg, 2014-07-09 21:08:19]

lgtm

[commit-bot: I haz the power, 2014-07-09 21:16:19]

Change committed as 282123