Remove a bunch of cases where WPT are asserting exact error messages
Where the error is created in script and a portion of the message is
test-defined, assert that the message includes the expected text.
Where the error message is coming from the browser implementation,
assert only the error or exception type.
Change-Id: I0f696a40578ea6e9d106546a42ea2d68745498fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5754822
Auto-Submit: Nate Chapin japhet@chromium.org
Reviewed-by: Domenic Denicola domenic@chromium.org
Commit-Queue: Domenic Denicola domenic@chromium.org
Cr-Commit-Position: refs/heads/main@{#1337137}