Devtools console web tests are flaky

These tests are already flaky, but are also causing crashes and timeouts.
http/tests/devtools/console/console-object-preview.js
http/tests/devtools/console/console-preserve-scroll.js
http/tests/devtools/console/console-search.js

TBR=szuend@chromium.org

https://test-results.appspot.com/data/layout_results/Mac10_13_Tests__dbg_/18959/blink_web_tests/layout-test-results/results.html
https://test-results.appspot.com/data/layout_results/Mac10_13_Tests__dbg_/18958/blink_web_tests/layout-test-results/results.html
https://test-results.appspot.com/data/layout_results/Mac10_13_Tests__dbg_/18957/blink_web_tests/layout-test-results/results.html

Bug: 1046784
Change-Id: Id3182dcd2f56f5a6536f4dc03f4b69e00ea7a11e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2254580Reviewed-by: Aaron Krajeski <aaronhk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780375}

third_party/blink/web_tests/TestExpectations

@@ -6819,9 +6819,9 @@ crbug.com/1092975 http/tests/inspector-protocol/target/target-expose-devtools-pr
 
 crbug.com/1096493 external/wpt/webaudio/the-audio-api/the-audiocontext-interface/processing-after-resume.https.html [ Failure ]
 
-crbug.com/1097005 http/tests/devtools/console/console-object-preview.js [ Pass Failure ]
-crbug.com/1097005 http/tests/devtools/console/console-preserve-scroll.js [ Pass Failure ]
-crbug.com/1097005 http/tests/devtools/console/console-search.js [ Pass Failure ]
+crbug.com/1097005 http/tests/devtools/console/console-object-preview.js [ Pass Failure Crash Timeout ]
+crbug.com/1097005 http/tests/devtools/console/console-preserve-scroll.js [ Pass Failure Crash Timeout ]
+crbug.com/1097005 http/tests/devtools/console/console-search.js [ Pass Failure Crash Timeout ]
 
 crbug.com/1093445 http/tests/loading/pdf-commit-load-callbacks.html [ Pass Failure ]
 crbug.com/1093497 http/tests/history/client-redirect-after-push-state.html [ Pass Failure ]