GitLab

This renames aura::WindowObserver's OnPropertyChanged()
method to have the word "window" in its name, as all of the
class's other methods do.

BUG=none
TEST=built it

Review URL: http://codereview.chromium.org/8621003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111066 0039d316-1c4b-4281-b951-d872f2087c98