DevTools: Disable scope tests before making changes

This CL disables tests that will be broken by
https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/1889351

Bug: 963183
Change-Id: I4f660dfad9a8e4e44d5200f61642174fba875bf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1894014
Commit-Queue: Jack Lynch <jalyn@microsoft.com>
Reviewed-by: Lorne Mitchell <lomitch@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#712767}

third_party/blink/web_tests/TestExpectations

@@ -5762,3 +5762,6 @@ crbug.com/1021407 [ Mac10.11 ] media/controls/video-overlay-cast-dark-rendering.
 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 ]
+
+# Temporarily disabled to land scope changes in DevTools
+crbug.com/963183 http/tests/devtools/sources/debugger-pause/set-return-value.js [ Pass Failure ]