Delete TestRunner library

BUG=324658
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/118723004

git-svn-id: svn://svn.chromium.org/blink/trunk@164235 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Improve custom element registration exception messages.

BUG=270033

Review URL: https://codereview.chromium.org/109653009

git-svn-id: svn://svn.chromium.org/blink/trunk@164236 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Update core/html's remaining generic DOM exception messages.

BUG=270033

Review URL: https://codereview.chromium.org/117823005

git-svn-id: svn://svn.chromium.org/blink/trunk@164237 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Improve Element exception messages.

BUG=270033

Review URL: https://codereview.chromium.org/108093006

git-svn-id: svn://svn.chromium.org/blink/trunk@164238 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add ExceptionState checks in Document::createElement*() methods.

Check if nested createElement() / createElementNS() calls have
reported exceptions and return early if so. Missing in two cases.

R=
BUG=

Review URL: https://codereview.chromium.org/112353004

git-svn-id: svn://svn.chromium.org/blink/trunk@164239 bbb929c8-8fbe-4397-9dbb-9b2b20218538