Revert "Connect PPAPI IPC channels for non-SFI mode."

This reverts commit 3d41a2a63bbd307fcee6e6c5547ce5fe29e2f4a5.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@252506 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 252506