[unified-heap] Adjust test expectations

This is a fixup after commits related to crbug.com/887148

Tbr: haraken@chromium.org
No-try: true
Bug: chromium:843903
Change-Id: I58530721a40968bd31db08ce5adda9a7b87a9157
Reviewed-on: https://chromium-review.googlesource.com/c/1317898Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605477}

third_party/WebKit/LayoutTests/flag-specific/enable-blink-features=HeapUnifiedGarbageCollection/fast/dom/StyleSheet/gc-rule-children-wrappers-expected.txt

@@ -2,7 +2,6 @@ Test that custom properties on rule style declarations are not lost after GC
 
 On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
 
-
 PASS document.styleSheets[0].cssRules[0].type is CSSRule.IMPORT_RULE
 PASS document.styleSheets[0].cssRules[0].media.foo is 'bar'
 PASS document.styleSheets[0].cssRules[0].type is CSSRule.IMPORT_RULE

third_party/WebKit/LayoutTests/flag-specific/enable-blink-features=HeapUnifiedGarbageCollection/fast/dom/gc-9-expected.txt

@@ -98,4 +98,3 @@ DOM EVENT BEFORE GARBAGE COLLECTION
 PASS: event.myCustomProperty should be 1 and is.
 DOM EVENT AFTER GARBAGE COLLECTION
 PASS: event.myCustomProperty should be 1 and is.
-