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Mac creates a mini-framework in `ui_unittests Framework` so that ui
tests can get a resource bundle without depending on the Chrome
framework.

The way it generated locale information was causing build flakes since
two instances of repack_locales.py could be writing to
out/../gen/repack. Tests always use en-US, so instead just repack the
strings made for ui_test.pak to en.lproj/locale.pak and roll it into the
mini-framework bundle.

Note we can't simply copy ui_test.pak because Mac system libraries will
annoy valgrind with leaks when they encounter unexpected things in it.

BUG=410468, 413034

Review URL: https://codereview.chromium.org/565063002

Cr-Commit-Position: refs/heads/master@{#294774}