Convert bitfields to bool in SelectorChecker.

Source/core/css/SelectorChecker.h

Index: Source/core/css/SelectorChecker.h
diff --git a/Source/core/css/SelectorChecker.h b/Source/core/css/SelectorChecker.h
index 563f00d6143fe2adc9b292d1499c418f203b72fb..0412f993dc0e8eb24681fcbb9b917e616526ff0e 100644
--- a/Source/core/css/SelectorChecker.h
+++ b/Source/core/css/SelectorChecker.h
@@ -81,12 +81,12 @@ public:
         ComputedStyle* elementStyle;
         RawPtrWillBeMember<LayoutScrollbar> scrollbar;
         ScrollbarPart scrollbarPart;
-        unsigned isSubSelector : 1;
-        unsigned hasScrollbarPseudo : 1;
-        unsigned hasSelectionPseudo : 1;
-        unsigned isUARule : 1;
-        unsigned scopeContainsLastMatchedElement : 1;
-        unsigned treatShadowHostAsNormalScope : 1;
+        bool isSubSelector;
+        bool hasScrollbarPseudo;
+        bool hasSelectionPseudo;
+        bool isUARule;
+        bool scopeContainsLastMatchedElement;
+        bool treatShadowHostAsNormalScope;
     };
 
     struct MatchResult {