tree 98addbb3533c745781bc26e4a55cbbdd6d6e97e7
parent 762f0a5bdd238458bbb463a9565388f2047a98d4
author Mathieu Chartier <mathieuc@google.com> 1408837047 -0700
committer Mathieu Chartier <mathieuc@google.com> 1408838064 -0700

Clean up Handle usage.

Prefer using ConstHandle instead of Handle as function arguments
since you can't assign new references to ConstHandle which helps
prevent bugs.

Changed NullHandle to be a ConstHandle so that you can never modify
it to be a non null reference.

Change-Id: I81cb979f6f8d5b49e5614966a2caf28c3701dd4f