[DevTools] Temporarily disable test

DevTools CL: https://crrev.com/c/2485085
Re-enable Tests CL: https://crrev.com/c/2485068

Design doc: https://goo.gle/devtools-si
Bug: chromium:1035309

Change-Id: I9e77685dc09ec4d6c569712067bbda778755c5fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2487269Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Wolfgang Beyer <wolfi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822096}

third_party/blink/web_tests/TestExpectations

@@ -6053,6 +6053,7 @@ crbug.com/1107944 [ Mac ] http/tests/devtools/tracing/timeline-paint/timeline-pa
 
 # Temporarily disable tests to allow a fix in devtools frontend
 crbug.com/1011811 http/tests/devtools/modules-load-initial.js [ Pass Failure ]
+crbug.com/1035309 http/tests/devtools/throttling/mobile-throttling.js [ Pass Failure ]
 
 crbug.com/1092794 fast/canvas/OffscreenCanvas-2d-placeholder-willReadFrequently.html [ Pass Failure ]