Use region code to pick regulatory label
To enable region-specific product labels, we're changing where labels
are installed: https://chrome-internal-review.googlesource.com/#/c/215311/
Manufacturers will include a label for each region they want to configure.
At run-time, the correct label will be chosen if found.
Note: I've also renamed "product label" to "regulatory label", because
"product" refers to the Chrome software, not the device, in the rest of
the About page code.
BUG=436179
R=dbeam@chromium.org,stevenjb@chromium.org
Review URL: https://codereview.chromium.org/
1164513004
Cr-Commit-Position: refs/heads/master@{#334558}