Revert of exclude PhishingDOMFeatureExtractorTest.* browser_tests on Dr. Memory bots

Revert of exclude PhishingDOMFeatureExtractorTest.* browser_tests on Dr. Memory bots (patchset #1 id:1 of https://codereview.chromium.org/1371193003/ )

Reason for revert:
I'm reverting the relevant CL, https://codereview.chromium.org/1373993002/

so this exclusion is no longer necessary.

Original issue's description:
> exclude PhishingDOMFeatureExtractorTest.* browser_tests on Dr. Memory bots
>
> TBR=erikchen@chromium.org
> BUG=536891
> NOTRY=true
>
> Committed: https://crrev.com/2b4bfec5eab7ab8986557934ef9bd27e87c8e22b
> Cr-Commit-Position: refs/heads/master@{#351107}

TBR=zhaoqin@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=536891
Committed: https://crrev.com/bcfea02ff4fea4428ca58509b69890b0503d8dfa
Cr-Commit-Position: refs/heads/master@{#351129}

[erikchen, 2015-09-28 20:26:11]

Created Revert of exclude PhishingDOMFeatureExtractorTest.* browser_tests on Dr.
Memory bots

[commit-bot: I haz the power, 2015-09-28 20:27:03]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1375743002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1375743002/1

[commit-bot: I haz the power, 2015-09-28 20:29:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-28 20:31:43]

Patchset 1 (id:??) landed as
https://crrev.com/bcfea02ff4fea4428ca58509b69890b0503d8dfa
Cr-Commit-Position: refs/heads/master@{#351129}