DevTools: Disable tests before landing Watch changes

This CL disables a few web tests that will be broken by [1] and
reenabled by [2].

[1] https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1884528
[2] https://chromium-review.googlesource.com/c/chromium/src/+/1811866

Change-Id: I1c6527959c13ec3951425b5c3fd24876c59bbc34
Bug: 963183
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887737Reviewed-by: Lorne Mitchell <lomitch@microsoft.com>
Commit-Queue: Jack Lynch <jalyn@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#712746}

third_party/blink/web_tests/TestExpectations

@@ -5757,3 +5757,8 @@ crbug.com/1011466 virtual/threaded/http/tests/devtools/tracing/timeline-network/
 crbug.com/1021407 [ Retina Release ] virtual/audio-service/media/video-controls-rendering.html [ Pass Failure ]
 crbug.com/1021407 [ Mac10.11 ] virtual/audio-service/media/controls/video-overlay-cast-dark-rendering.html [ Pass Failure ]
 crbug.com/1021407 [ Mac10.11 ] media/controls/video-overlay-cast-dark-rendering.html [ Pass Failure ]
+
+# Temporarily disabled to land accessibility changes in DevTools
+crbug.com/963183 http/tests/devtools/sources/debugger-ui/error-in-watch-expressions.js [ Pass Failure ]
+crbug.com/963183 http/tests/devtools/sources/debugger-ui/watch-expressions-preserve-expansion.js [ Pass Failure ]
+crbug.com/963183 http/tests/devtools/sources/debugger/debugger-proto-property.js [ Pass Failure ]