Remove useless checks for webkit-min/max

This patch removes a couple of checks for webkit-min/max, which were
accidentally left in when removing parsing support:
https://src.chromium.org/viewvc/blink?revision=171550&view=revision

Review URL: https://codereview.chromium.org/350573003

git-svn-id: svn://svn.chromium.org/blink/trunk@177199 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: fix responsive design view broken by r177098

TBR=pfeldman,dgozman

Review URL: https://codereview.chromium.org/359293002

git-svn-id: svn://svn.chromium.org/blink/trunk@177200 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Throws a TypeError when header does not contain exactly two items.

https://www.w3.org/Bugs/Public/show_bug.cgi?id=26217
https://github.com/whatwg/fetch/commit/fb8df66cdd69e5a5afcdd7e213875ec8cd299b10

BUG=373120

Review URL: https://codereview.chromium.org/359283002

git-svn-id: svn://svn.chromium.org/blink/trunk@177201 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add comment in Headers.idl

"We should support Headers.prototype[Symbol.iterator]."

BUG=373120

Review URL: https://codereview.chromium.org/353333002

git-svn-id: svn://svn.chromium.org/blink/trunk@177202 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Move XMLErrors.{cpp,h} from core/xml/ to core/xml/parser/.

Only XMLDocumentParser uses XMLErrors.

BUG=

Review URL: https://codereview.chromium.org/360673003

git-svn-id: svn://svn.chromium.org/blink/trunk@177203 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Disallow fullscreen from within <frame>, even with allowfullscreen

This was fixed once before in WebKit:
http://trac.webkit.org/changeset/84706

Unfortunately, webkitfullscreenallowed was the wrong attribute name
and it was added to the wrong <frame> element, so the test didn't
catch when this regressed some time between then and now.

The updated test has been verified to fail without this fix.

BUG=390041

Review URL: https://codereview.chromium.org/356303004

git-svn-id: svn://svn.chromium.org/blink/trunk@177204 bbb929c8-8fbe-4397-9dbb-9b2b20218538