Create a new component //components/undo and move files from
//chrome/browser/undo into the component.

Add DEPS, OWNERS files and add dependencies on the new component into
chrome/browser/BUILD.gn & chrome/chrome_browser.gypi.

Files where moved using tools/git/move_source_files.py and the #include
lines updated automatically by the script.

BUG=476921

Review URL: https://codereview.chromium.org/1090993003

Cr-Commit-Position: refs/heads/master@{#325718}