[DevTools] Re-enable web_tests

Reland 2246182

https://chromium-review.googlesource.com/c/chromium/src/+/2220809
disabled web_tests for the frontend to be checked in.

Bug: crbug.com/1066595
Change-Id: I48284ea715d7a50a46ac301106171c4cbc57839a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2255878Reviewed-by: Brandon Goddard <brgoddar@microsoft.com>
Commit-Queue: Songtao Xia <soxia@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#781185}

third_party/blink/web_tests/TestExpectations

@@ -6656,7 +6656,6 @@ crbug.com/1066716 http/tests/cache/zero-length-xhr.html [ Pass Timeout ]
 crbug.com/1067533 [ Mac10.10 ] external/wpt/shape-detection/idlharness.https.any.sharedworker.html [ Pass Failure ]
 
 # Temporarily disabled for landing changes to DevTools frontend
-crbug.com/1066595 http/tests/devtools/tracing/timeline-network/timeline-network-resource.js [ Pass Failure ]
 crbug.com/1066579 http/tests/devtools/har-importer.js [ Pass Failure ]
 
 # Flaky test, happens only on Mac 10.13.

third_party/blink/web_tests/http/tests/devtools/tracing/timeline-network/timeline-network-resource-expected.txt

@@ -26,6 +26,7 @@ ResourceReceiveResponse Properties:
         fromServiceWorker : false
         mimeType : "text/html"
         requestId : <string>
+        responseTime : <number>
         statusCode : 200
         timing : <object>
     }
@@ -78,6 +79,7 @@ ResourceReceiveResponse Properties:
         fromServiceWorker : false
         mimeType : "application/x-javascript"
         requestId : <string>
+        responseTime : <number>
         statusCode : 200
         timing : <object>
     }