Let the Escape key dimiss the active modal <dialog>

With this patch, hitting Escape causes a 'cancel'
event to be fired at the <dialog>. The default
action of 'cancel' is to close the dialog.

This is as per the spec, under "Canceling dialogs":
http://www.whatwg.org/specs/web-apps/current-work/multipage/commands.html#the-dialog-element

BUG=253357

Review URL: https://chromiumcodereview.appspot.com/23423003

git-svn-id: svn://svn.chromium.org/blink/trunk@156811 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Fix the remaining wtf includes.

Patch generated with thakis's script:

git grep -l '#include <wtf' | xargs sed -i -e 's/#include <\(wtf\/[^>]*\)>/#include "\1"/'

BUG=254653
R=abarth@chromium.org,thakis@chromium.org

Review URL: https://chromiumcodereview.appspot.com/23554006

git-svn-id: svn://svn.chromium.org/blink/trunk@156812 bbb929c8-8fbe-4397-9dbb-9b2b20218538