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This CL removes the hardcoded list of files in the updater's setup.
At runtime, the setup copies all files unpacked by the metainstaller, or
uses a build-generated dependency file to determine what files it needs
to install, if `updater --install` is run from the `out` directory of
the build.

The CL introduces a new command line argument `--install-from-out-dir`,
which is used in addition to other command line arguments of
`--install`.

This CL fixes the issue where --install could not find the
`uninstall.cmd` file when run from the `out` dir.

Bug:1069264,1054685

Change-Id: I03382b6d60fc71352a650e90b9abad6a85f085e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2146082Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Sorin Jianu <sorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758416}