91714 - CheckLoadURI should trest 'safe' and 'unsafe' about: URLs as different protocols
56260 - 'Remember This Decision' in signed script grant dialog should default to unchecked
83131 - More descriptive security error messages
93951 - Added null check in GetBaseURIScheme to prevent crash.
All bugs r=jtaylor, sr=jst
git-svn-id: svn://10.0.0.236/trunk@100964 18797224-902f-48f8-a5cc-f745e15eee43