[Benchmarks] Remove V8.TodoMVC benchmark

This benchmark is no longer of use because we are running
RCS-based benchmarks nowadays.

R=nednguyen@google.com,mvstanton@chromium.org,jochen@chromium.org

Review-Url: https://codereview.chromium.org/2837583002
Cr-Commit-Position: refs/heads/master@{#466327}
7 files changed