Add comment about the send_referrer parameter of ContentRendererClient::ShouldFork

R=jam@chromium.org
NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/24182008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224945 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224945
Added quotes around 'wix_path%' or 'sas_dll_path%' to handle paths with spaces.

BUG=297009

Review URL: https://chromiumcodereview.appspot.com/24366003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224947 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224947