Make the InternetConfigDialog unresizable.

crbug/811701 is originally about the buttons moving when this dialog is
resized. However, really this dialog shouldn't be resizable in the
first place.

Bug: 811701
Change-Id: I41a73659633542a8b1b8c6bee8511a27d3d5ecf9
Tested: Manually verified the dialog isn't resizable anymore.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1533289
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Jeremy Klein <jlklein@chromium.org>
Auto-Submit: Jeremy Klein <jlklein@chromium.org>
Cr-Commit-Position: refs/heads/master@{#643080}
4 files changed