Revert of Mark WebappSplashScreenIconTest#testShowSplashIcon as flaky

Revert of Mark WebappSplashScreenIconTest#testShowSplashIcon as flaky (patchset #1 id:1 of https://codereview.chromium.org/1436163003/ )

Reason for revert:
dfalcantara@ fixed a larger issue with web apps tests on N4 devices. Reverting this in case of his CL fixed the problem.

Original issue's description:
> Mark WebappSplashScreenIconTest#testShowSplashIcon as flaky
>
> Added in https://codereview.chromium.org/1414873004
>
> TBR=dfalcantara@chromium.org
> BUG=554929
>
> Committed: https://crrev.com/567ee4cbb84855641304da750f4865b95eb18054
> Cr-Commit-Position: refs/heads/master@{#359304}

TBR=dfalcantara@chromium.org,dgn@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=554929
Committed: https://crrev.com/710d4ab0013c424ab259bdfebe63c85c13846722
Cr-Commit-Position: refs/heads/master@{#360636}

[mlamouri (slow - plz ping), 2015-11-19 19:01:42]

Created Revert of Mark WebappSplashScreenIconTest#testShowSplashIcon as flaky

[commit-bot: I haz the power, 2015-11-19 19:03:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1453243005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1453243005/1

[commit-bot: I haz the power, 2015-11-19 19:05:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-19 19:06:28]

Patchset 1 (id:??) landed as
https://crrev.com/710d4ab0013c424ab259bdfebe63c85c13846722
Cr-Commit-Position: refs/heads/master@{#360636}