Gardening: add Leak expectations for a few tests

imported/web-platform-tests/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-methods/test-004.html
imported/web-platform-tests/shadow-dom/user-interaction/ranges-and-selections/test-001.html
imported/web-platform-tests/shadow-dom/user-interaction/ranges-and-selections/test-002.html

NOTRY=true
BUG=413731
TBR= dpranke@chromium.org, jianli@chromium.org

Review URL: https://codereview.chromium.org/569673002

git-svn-id: svn://svn.chromium.org/blink/trunk@181914 bbb929c8-8fbe-4397-9dbb-9b2b20218538