Update shell_aura.cc to get aura::Window for dispatcher.

This change is related to CL: https://codereview.chromium.org/172743002 where
RootWindow was renamed to WindowEventDispatcher.

This fixes the Ozone build which uses shell_aura.cc

TBR=ben@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/177713003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253011 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253011
Pepper: Get rid of UNPROXIED_IFACE.

PROXIED_IFACE and UNPROXIED_IFACE always have the same behavior now. There's no
need to have two macros for this.

BUG=
R=dmichael@chromium.org

Review URL: https://codereview.chromium.org/165393016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@253012 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 253012