Remove all grab widget in screen locker.

Remove all grab widget in screen locker so that gtk simply propagate events,
 instead of adding window_contents_ as grab widget.
 Explicitly adding grab widget was confusing gtk and the event has been handled by grab widget rather than by the window the event is forwarded to.
 This CL fixes it by removing all grab widget and let gtk propagage event in target window.

BUG=none
TEST=open screen locker, type wrong password to show message bubble,
then close it by clicking close (x) button.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=49314

[sky, 2010-06-09 18:54:26]

LGTM

http://codereview.chromium.org/2788001/diff/11001/12001
File chrome/browser/chromeos/login/screen_locker.cc (right):

http://codereview.chromium.org/2788001/diff/11001/12001#newcode91
chrome/browser/chromeos/login/screen_locker.cc:91: // Make sure there is no grab
widget so that gtk simply propagages
propagages -> propagates

http://codereview.chromium.org/2788001/diff/11001/12001#newcode92
chrome/browser/chromeos/login/screen_locker.cc:92: // an event.  This is
necessary to allow messag bubble and password
message

http://codereview.chromium.org/2788001/diff/11001/12001#newcode195
chrome/browser/chromeos/login/screen_locker.cc:195: // DLOG(INFO) << "ignore
event src non grab window: " << event->type;
Just nuke the DLOG.