Pepper: More interface_list cleanup.

This change removes a deprecated AddPPP() interface, and a new unnecessary
InterfaceProxy::Info struct.

BUG=
R=dmichael@chromium.org

Review URL: https://codereview.chromium.org/113263003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241352 0039d316-1c4b-4281-b951-d872f2087c98
Blink roll 164009:164025

http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=164010:164025&mode=html
TBR=
BUG=

Review URL: https://codereview.chromium.org/99133030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241353 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241352
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241354 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241354