Remove TYPE_MALWARE_AND_PHISHING from Safe Browsing blocking page

Remove TYPE_MALWARE_AND_PHISHING from Safe Browsing blocking page

Delete support for TYPE_MALWARE_AND_PHISHING, since the warning now
always shows the malware warning if it's both.

BUG=
R=mattm@chromium.org

Committed: https://crrev.com/8cf7cebb582ec1a6b3639a3b89f08ff9772ca301
Cr-Commit-Position: refs/heads/master@{#295067}

[felt, 2014-09-16 04:49:07]

PTAL

[mattm, 2014-09-16 07:36:07]

lgtm

[felt, 2014-09-16 14:25:17]

The CQ bit was checked by felt@chromium.org

[commit-bot: I haz the power, 2014-09-16 14:26:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/572023003/1

[commit-bot: I haz the power, 2014-09-16 15:06:35]

Committed patchset #1 (id:1) as 79a917e31595c1a57031a439e59cf0b06aa5dbb3

[commit-bot: I haz the power, 2014-09-16 15:10:41]

Patchset 1 (id:??) landed as
https://crrev.com/8cf7cebb582ec1a6b3639a3b89f08ff9772ca301
Cr-Commit-Position: refs/heads/master@{#295067}