LeakExpectations: suppress crash from multiple-register.html

BUG=397892
TBR=hajimehoshi
NOTRY=true

Review URL: https://codereview.chromium.org/415403003

git-svn-id: svn://svn.chromium.org/blink/trunk@178995 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/LayoutTests/LeakExpectations

@@ -5,6 +5,8 @@
 # Gardeners are welcome to touch this file, but you can ignore the failures
 # and wait for kouhei@ or hajimehoshi@ to maintain this file.
 
+crbug.com/397892 LayoutTests/http/tests/serviceworker/multiple-register.html [ Crash ]
+
 # view-source:// tests are not supported by the leak detector
 crbug.com/364398 fast/frames/viewsource/viewsource-1.html [ Leak ]
 crbug.com/364398 fast/frames/viewsource/viewsource-2.html [ Leak ]