Remove unneccesary cast to Node* in MediaControlTextTrackContainerElement::updateDisplay

TextTrackCue is a Node, there's no reason to static_cast from it to Node*.

Review URL: https://chromiumcodereview.appspot.com/17191007

git-svn-id: svn://svn.chromium.org/blink/trunk@152865 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Replace static_cast<Element*> with toElement

Turns out only Node had some left.

Review URL: https://chromiumcodereview.appspot.com/17094020

git-svn-id: svn://svn.chromium.org/blink/trunk@152866 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Remove executable bit from *.js files under Source/devtools/front_end

BUG=None
R=loislo@chromium.org

Review URL: https://codereview.chromium.org/17541002

git-svn-id: svn://svn.chromium.org/blink/trunk@152867 bbb929c8-8fbe-4397-9dbb-9b2b20218538