Update chromium.googlesource.com links in web_tests

Replace instances of "master" in web_tests

Change-Id: Ia08435a1b33609ed1f7ea2c0f4baa2814afd2b13
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3411716
Auto-Submit: Eric Willigers <[email protected]>
Reviewed-by: Louise Brett <[email protected]>
Commit-Queue: Louise Brett <[email protected]>
Cr-Commit-Position: refs/heads/main@{#962733}
diff --git a/third_party/blink/web_tests/W3CImportExpectations b/third_party/blink/web_tests/W3CImportExpectations
index 6c6c8442..246e0cbb 100644
--- a/third_party/blink/web_tests/W3CImportExpectations
+++ b/third_party/blink/web_tests/W3CImportExpectations
@@ -11,7 +11,7 @@
 # used to make it easier to work on getting them running and passing.
 #
 # Further documentation:
-# https://chromium.googlesource.com/chromium/src/+/master/docs/testing/web_test_expectations.md
+# https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_test_expectations.md
 
 external/wpt/.codecov.yml [ Skip ]
 external/wpt/.github [ Skip ]