[DevTools] Disable test for Network Panel changes

This cl disables a test to land crrev.com/c/19671359.

Tbr: yangguo@chromium.org
Bug: chromium:1019723
Change-Id: I458397c58d1b8fe96d7e13054ee9f813ef64559b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1985772
Commit-Queue: Jan Scheffler <janscheffler@chromium.org>
Commit-Queue: Mathias Bynens <mathias@chromium.org>
Auto-Submit: Jan Scheffler <janscheffler@chromium.org>
Reviewed-by: Mathias Bynens <mathias@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727976}

third_party/blink/web_tests/TestExpectations

@@ -6081,6 +6081,7 @@ crbug.com/1029826 http/tests/devtools/copy-network-request.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/1030258 http/tests/devtools/components/cookie-parser.js [ Pass Failure ]
 crbug.com/1030258 http/tests/devtools/network/network-cookies-pane.js [ Pass Failure ]
+crbug.com/1019723 http/tests/devtools/network/waterfall-header-height-updates.js [ Pass Failure ]
 
 # Enable scroll-snap tests on impl thread
 # These are currently failing on Mac which needs more investigation, snap-scrolls-visual-viewport seems flaky