Fix data race in inspector/profiler/heap-snapshot-loader.html

Make sure _reciever is closed only once to avoid exceptions in the heap snapshot worker.

BUG=330617
R=loislo@chromium.org

Review URL: https://codereview.chromium.org/131023006

git-svn-id: svn://svn.chromium.org/blink/trunk@165454 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Update of change event for datetime input type

BaseMultipleFieldDateAndTime includes changes for sending change event when popup is closed, keyboard event and mouse event.

BaseChoosedOnlyDateAndTime includes changes for sending change event when popup is closed. Special case for input type datetime-local.

R=tkent
BUG=155747
TEST=Fixes currently broken test in bug331189

Review URL: https://codereview.chromium.org/128153002

git-svn-id: svn://svn.chromium.org/blink/trunk@165455 bbb929c8-8fbe-4397-9dbb-9b2b20218538