Remove render process and WebContents notifications from background printing.

BUG=170921
TEST=everything still works, bug 100806 doesn't regress

Review URL: https://codereview.chromium.org/133013002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244391 0039d316-1c4b-4281-b951-d872f2087c98
Set +x on clang-format-diff.py.

Hopefully fixes check_perms on
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Full/builds/30915/steps/check_perms/logs/stdio

BUG=240309
TBR=nick@chromium.org

Review URL: https://codereview.chromium.org/135123003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244392 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 244392