Layout Test inspector/styles/multiple-imports-edit-crash.html is flaky

BUG=280698
TBR=rjkroege@chromium.org

Review URL: https://codereview.chromium.org/23724003

git-svn-id: svn://svn.chromium.org/blink/trunk@156877 bbb929c8-8fbe-4397-9dbb-9b2b20218538