Make blink classes and structures in core/css fast-allocated

Source/core/css/StyleRuleImport.h

Index: Source/core/css/StyleRuleImport.h
diff --git a/Source/core/css/StyleRuleImport.h b/Source/core/css/StyleRuleImport.h
index 8af71928aeef025c1bf30352ff26468f1f21382a..5aa59e6bdf326726497a9b911d06ea00fb101c36 100644
--- a/Source/core/css/StyleRuleImport.h
+++ b/Source/core/css/StyleRuleImport.h
@@ -59,6 +59,7 @@ private:
     // NOTE: We put the StyleSheetResourceClient in a member instead of inheriting from it
     // to avoid adding a vptr to StyleRuleImport.
     class ImportedStyleSheetClient final : public StyleSheetResourceClient {
+        DISALLOW_ALLOCATION();
     public:
         ImportedStyleSheetClient(StyleRuleImport* ownerRule) : m_ownerRule(ownerRule) { }
         ~ImportedStyleSheetClient() override { }