tree cd2eae058f4f4f13b5a82ff557b7eaaf13a1ecfb
parent 115a02b737dd5f4d485b2f6c359e02988df66b83
author Mathieu Chartier <mathieuc@google.com> 1450720696 -0800
committer Mathieu Chartier <mathieuc@google.com> 1450720696 -0800

Rename NullHandle to ScopedNullHandle

This makes it clearer that is invalid to do things like:
Handle<T> h = ScopedNullHandle<T>();

Bug: 26233305
Change-Id: I6d8f54eae01ec2e901cb7043afa853ea77db79fe