Make javascript dialogs into top-level windows for desktop aura.

Also, correct aura window sizing on desktop aura for Windows.

BUG=230935, 234558, 225252
TEST=NONE (yet)

Review URL: https://chromiumcodereview.appspot.com/13896011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@197949 0039d316-1c4b-4281-b951-d872f2087c98
6 files changed