Fix crash 12519: in views::DialogClientView::AcceptWindow()
Fix crash 12519: in views::DialogClientView::AcceptWindow()

We don't have repro steps for this crash so this
is a blind fix.

But looking at the function that crashes and the
history of this file I see:

Ben's r11070 and r11047: Which add this check.
Ben's r11132: Which removes this check (according
to the comments it is a test to see if we can get
away with it).

It looks to me like the check would prevent the
crash and since this is still crashing, I am
proposing we re-add it.

BUG=12519
TEST=We'll need to verify this by checking the
crash dumps sent from the field.

Review URL: http://codereview.chromium.org/119183

git-svn-id: http://src.chromium.org/svn/trunk/src@17651 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 35a98d763d65b8269c77342ac8a6dd0ff490e646
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser