Move undoview to deps/third_party/

This change copies src/third_party/undoview to deps/third_party/undoview. A
later change will update src/ to use this copy via DEPS.

The motivation is to allow developers to exclude the project from their source
tree.

BUG=111334

Review URL: http://codereview.chromium.org/9289019

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/undoview@119694 4ff67af0-8c30-449e-8e8b-ad334ec8d88c