Mark more tests as NeedsRebaseline after r171050

The tests started failing with image diff after r171050 (http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.6/builds/26222/steps/webkit_tests/logs/stdio)

BUG=347510
TBR=h.joshi@samsung.com,jianli@chromium.org

Review URL: https://codereview.chromium.org/226503005

git-svn-id: svn://svn.chromium.org/blink/trunk@171054 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Left-most derive the GC base in HTMLMediaElement.

This is now required by the Blink GC plugin.

R=ager@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/228543002

git-svn-id: svn://svn.chromium.org/blink/trunk@171055 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add guards on frame().

It seems reasonable to guard against the lack of a frame,  then verify if the small number of crashes reported in
http://crbug.com/360391 go away.

BUG=360391

Review URL: https://codereview.chromium.org/227803002

git-svn-id: svn://svn.chromium.org/blink/trunk@171056 bbb929c8-8fbe-4397-9dbb-9b2b20218538