Revert of Browser tests for the ChromeOS chromecast system tray item.

Revert of Browser tests for the ChromeOS chromecast system tray item. (patchset #3 id:60001 of https://codereview.chromium.org/1287023010/ )

Reason for revert:
broke the compile on ChromeOS bots:

FAILED: ...
../../chrome/browser/ui/ash/system_tray_tray_cast_browsertest_chromeos.cc:53:10: error: variable 'result' is uninitialized when used here [-Werror,-Wuninitialized]
  return result;
         ^~~~~~
../../chrome/browser/ui/ash/system_tray_tray_cast_browsertest_chromeos.cc:51:14: note: initialize the variable 'result' to silence this warning
  bool result;
             ^
              = false

Original issue's description:
> Browser tests for the ChromeOS chromecast system tray item.
>
> This was initially reviewed in https://codereview.chromium.org/1231593002/. I've
> moved this to a new CL since there have been a few implementation changes and as
> a result this needs another look.
>
> BUG=497343, 514952
>
> Committed: https://crrev.com/926097380c61018aa2d5dfc99299f592ccfa5738
> Cr-Commit-Position: refs/heads/master@{#344939}

TBR=achuith@chromium.org,oshima@chromium.org,jdufault@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=497343, 514952
Committed: https://crrev.com/aff2cdf3727ff6bd06c0e2193ab0c554f65ef1b6
Cr-Commit-Position: refs/heads/master@{#344946}

[Dan Beam, 2015-08-22 01:44:29]

Created Revert of Browser tests for the ChromeOS chromecast system tray item.

[commit-bot: I haz the power, 2015-08-22 01:44:53]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1307863004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1307863004/1

[commit-bot: I haz the power, 2015-08-22 01:45:38]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-08-22 01:46:20]

Patchset 1 (id:??) landed as
https://crrev.com/aff2cdf3727ff6bd06c0e2193ab0c554f65ef1b6
Cr-Commit-Position: refs/heads/master@{#344946}