Revert "Add Chromium-style TimeDelta, Time and TimeTicks classes, and a new ElapsedTimer class."

This reverts commit r16390 for breaking the Windows build. Will
reland fixed version, which also uses the platform/ folder instead
of time/ folder as per offline discussion.

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/23690003

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@16391 ce2b1a6d-e550-0410-aec6-3dcde31c8c00