Reland "[wptrunner] Remove `chrome` port and expectations"

This is a reland of commit 8964d40d2b94d73aa7209699401201f29dd3723f

Changes since original:
  Added a missing expectation file for
  external/wpt/wai-aria/role/contextual-roles.html. The try builds for
  the original CL passed but became stale because they predated
  https://crrev.com/c/5769811, which introduced the new failure.

Original change's description:
> [wptrunner] Remove `chrome` port and expectations
>
> Currently, the WPT infrastructure supports both content shell and chrome
> coverage on Linux simultaneously. The plan now is to open up chrome as
> an option on macOS and Windows, with the caveat that each WPT can only
> target one binary or the other. This will keep the number of
> expectations manageable and minimize the amount of redundant coverage.
>
> This CL:
> * Removes harness support for the `linux-chrome` option, since this will
>   be decided at the test level.
> * Renames `*-expected.txt` files out of the obsolete `linux-chrome`
>   directory as needed.
> * Removes ChromeTestExpectations, with any necessary wdspec test
>   expectations moved to TestExpectations.
>
> Bug: 328079854
> Change-Id: I205197b038e6441773b2d7307a83e8d5da3837a0
> Cq-Include-Trybots: luci.chromium.try:linux-blink-rel
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5747069
> Reviewed-by: Weizhong Xia <weizhong@google.com>
> Commit-Queue: Jonathan Lee <jonathanjlee@google.com>
> Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1338757}

Bug: 328079854
Fixed: 41484800
Change-Id: Ida08b37b629021d99fa3a92246ebcb48846fe284
Cq-Include-Trybots: luci.chromium.try:mac11.0-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac11.0.arm64-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac12.0-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac12.0.arm64-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac13-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac13.arm64-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac14-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac14.arm64-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac15-blink-rel
Cq-Include-Trybots: luci.chromium.try:mac15.arm64-blink-rel
Cq-Include-Trybots: luci.chromium.try:win11-blink-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5771704
Reviewed-by: Weizhong Xia <weizhong@google.com>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Weizhong Xia <weizhong@google.com>
Cr-Commit-Position: refs/heads/main@{#1339144}