Disable test to land cl in devtools-frontend

This cl disables a test to land changes in devtools-frontend.

CL: crrev.com/c/1950166

Bug: chromium:1030258
Change-Id: I56259952a85b330d4591613cf416bcb0565fe860
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949470Reviewed-by: Yang Guo <yangguo@chromium.org>
Commit-Queue: Jan Scheffler <janscheffler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721451}

third_party/blink/web_tests/TestExpectations

@@ -6036,6 +6036,7 @@ crbug.com/993790 external/wpt/document-policy/required-policy/required-document-
 crbug.com/1025667 http/tests/devtools/inspector-backend-commands.js [ Pass Failure ]
 crbug.com/1029031 http/tests/devtools/user-agent-setting-major-version.js [ Pass Failure ]
 crbug.com/1029489 http/tests/devtools/elements/elements-linkify-attributes.js [ Pass Failure ]
+crbug.com/1030258 http/tests/devtools/resource-har-conversion.js [ Pass Failure ]
 crbug.com/1029521 virtual/threaded/external/wpt/web-animations/timing-model/animations/updating-the-finished-state.html [ Pass Failure Timeout ]
 crbug.com/1029541 virtual/threaded/external/wpt/web-animations/timing-model/animations/reverse-running-animation.html [ Pass Failure ]