Adding allocator annotations to blink classes and structs.

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 fb173ef5e42074f29281243127e0d42fb9cc0560..dd60af17dbce906130fc1291e4b3b668d8f13510 100644
--- a/Source/core/css/SelectorChecker.h
+++ b/Source/core/css/SelectorChecker.h
@@ -42,6 +42,7 @@ class ComputedStyle;
 
 class SelectorChecker {
     WTF_MAKE_NONCOPYABLE(SelectorChecker);
+    STACK_ALLOCATED();
 public:
     enum VisitedMatchType { VisitedMatchDisabled, VisitedMatchEnabled };
     enum Mode { ResolvingStyle = 0, CollectingStyleRules, CollectingCSSRules, QueryingRules, SharingRules };
@@ -97,6 +98,7 @@ public:
 
         PseudoId dynamicPseudo;
         unsigned specificity;
+        STACK_ALLOCATED();
     };
 
     bool match(const SelectorCheckingContext&, MatchResult&) const;