Update readme

Change-Id: I859b6c87050b5c2eb7f43eb55b052a5bb125603a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1669648
Auto-Submit: Allen Robinson <arobins@chromium.org>
Reviewed-by: Ian Clelland <iclelland@chromium.org>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672088}

third_party/blink/web_tests/http/tests/origin_trials/webexposed/README.md

@@ -7,4 +7,4 @@ A virtual test suite (origin-trials-runtimeflags-disabled) covers
 this. Depending on the test, it may be necessary to add specific
 results in the directory:
 
-LayoutTests/virtual/origin-trials-runtimeflags-disabled/http/tests/origin_trials/webexposed/
+web_tests/virtual/origin-trials-runtimeflags-disabled/http/tests/origin_trials/webexposed/