Refactor ChangeInfo.Load() to make it possible to switch to a new format more easily.
Refactor ChangeInfo.Load() to make it possible to switch to a new format more easily.

The new format will be introduced in the next change.

TEST=not much, mostly manually tested.
BUG=none

Review URL: http://codereview.chromium.org/4106011

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@64600 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools