Fix test for a cl in devtools-frontend

This cl depends on crrev.com/c/1934213

Bug: chromium:1016772
Change-Id: I345d99b96dff194400c035d2885973feaca13ea0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1936249
Commit-Queue: Jan Scheffler <janscheffler@chromium.org>
Reviewed-by: Tim van der Lippe <tvanderlippe@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720462}

third_party/blink/web_tests/TestExpectations

@@ -6036,7 +6036,6 @@ crbug.com/993790 external/wpt/document-policy/required-policy/required-document-
 crbug.com/993790 external/wpt/document-policy/required-policy/required-document-policy.html [ Failure ]
 
 # Temporary suppression to allow devtools-frontend changes
-crbug.com/1016772 http/tests/devtools/sourcemap-section-warning.js [ Pass Failure ]
 crbug.com/1029489 http/tests/devtools/elements/elements-linkify-attributes.js [ Pass Failure ]
 
 crbug.com/1029521 virtual/threaded/external/wpt/web-animations/timing-model/animations/updating-the-finished-state.html [ Pass Failure Timeout ]

third_party/blink/web_tests/http/tests/devtools/sourcemap-section-warning-expected.txt

 Verify that sourcemap emits warning if there's a section with "url" field.
-error: TypeError: Cannot read property 'sourceRoot' of undefined
 Message count: 2
 SourceMap "http://127.0.0.1:8000/devtools/resources/source-map-warning.map.json" contains unsupported "URL" field in one of its sections.
 DevTools failed to parse SourceMap: http://127.0.0.1:8000/devtools/resources/source-map-warning.map.json