OffsetY() is only used by InfoBarView.  Move it there.

BUG=none
TEST=none
R=sky@chromium.org

Review URL: https://codereview.chromium.org/100753004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239541 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239541
Move us closer to shutting down cleanly.

This adds a Destroy() method to NativeViewportClient that the NVS can use to notify the app of NV destruction. The app should then halt its message loop and exit.

Note that we still crash on shutdown due to scheduled tasks continuing to want to touch the AcceleratedWidget post-destruction. We need to devise a better mechanism for this (see comment)

R=abarth@chromium.org
http://crbug.com/325901

Review URL: https://codereview.chromium.org/108193003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239542 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 239542