Devtools: disable http/tests/devtools/network/network-initiator-chain.js

Temporarily disable the test for landing this CL:
https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1874670

Bug: 842488
Change-Id: If5bfe378e5b9d656c645c64ff0a187fa41b81ef7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888378
Commit-Queue: Junyi Xiao <juxiao@microsoft.com>
Reviewed-by: Lorne Mitchell <lomitch@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#710589}

third_party/blink/web_tests/TestExpectations

@@ -5757,3 +5757,6 @@ crbug.com/1009396 http/tests/devtools/coverage/multiple-instances-merge.js [ Pas
 # Temporarily disable to land source map changes that log error on failure
 crbug.com/1016772 http/tests/devtools/compiler-script-mapping.js [ Pass Failure ]
 crbug.com/1016772 http/tests/devtools/sources/debugger-ui/source-url-comment.js [ Pass Failure ]
+
+# Temporarily disabled for landing initiator chain changes in DevTools
+crbug.com/842488 http/tests/devtools/network/network-initiator-chain.js [ Pass Failure ]