Gardening: add Leak expectations for a few tests

LayoutTests/LeakExpectations

Index: LayoutTests/LeakExpectations
diff --git a/LayoutTests/LeakExpectations b/LayoutTests/LeakExpectations
index 100a92c950fa552ff19642734a26294071d865d1..a4f4e1e52fa21483d285518907c24d8c7ca8961b 100644
--- a/LayoutTests/LeakExpectations
+++ b/LayoutTests/LeakExpectations
@@ -77,3 +77,9 @@ crbug.com/366455 svg/custom/svg-fonts-fallback.xhtml [ Leak ]
 crbug.com/403987 fast/dom/element-attribute-js-null.html [ Leak ]
 crbug.com/403363 http/tests/security/mixedContent/insecure-audio-video-in-main-frame.html [ Leak ]
 crbug.com/405125 media/media-controls-clone-crash.html [ Leak Pass ]
+
+
+# leaks in newly added web-platform tests
+crbug.com/413731 imported/web-platform-tests/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-methods/test-004.html [ Leak Failure ]
+crbug.com/413731 imported/web-platform-tests/shadow-dom/user-interaction/ranges-and-selections/test-001.html [ Leak Failure ]
+crbug.com/413731 imported/web-platform-tests/shadow-dom/user-interaction/ranges-and-selections/test-002.html [ Leak Failure ]