Protect FrameView in Document::updateLayout().

It's possible to dispatch events in postAttachCallbacks, and an event handler
could delete the FrameView.

BUG=324321
TEST=none; could not make a reliable test.

Review URL: https://codereview.chromium.org/98513002

git-svn-id: svn://svn.chromium.org/blink/trunk@162964 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Apply DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION to HTMLUnknownElement

DEFINE_NODE_TYPE_CASTS_WITH_FUNCTION supports more plenty helper functions than
manual toFoo().

BUG=309516

Review URL: https://codereview.chromium.org/98443003

git-svn-id: svn://svn.chromium.org/blink/trunk@162965 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Map websocket/tests/hybi directory to root on pywebsocket

Just map it to root so that we don't need to write "websocket/tests/hybi"
in all tests.

BUG=none

Review URL: https://codereview.chromium.org/96493002

git-svn-id: svn://svn.chromium.org/blink/trunk@162966 bbb929c8-8fbe-4397-9dbb-9b2b20218538