R1:93d7a1451b2e

Clean up file browse view a bit

Summary:
- Use DiffusionCommitQuery
- Get rid of the "Author" column.
- Collapse commit + revision together.
- Better tooltips to cover for the removed information.
- Colorize only the "line" column.
- Generally, reduce the amount of visual noise and non-code-stuff going on in this interface.
- I'd like to make the "<<" thing look nicer too but that might take some actual design.

Test Plan: See screenshots.

Reviewers: btrahan, chad

Reviewed By: chad

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