Make classes and structures in core/html fast-allocated.

Source/core/html/forms/StepRange.h

Index: Source/core/html/forms/StepRange.h
diff --git a/Source/core/html/forms/StepRange.h b/Source/core/html/forms/StepRange.h
index cec9e2dcff911aed19cdfd86029c40b29bbcbcbc..6450b9c4297476cb1be4e3ca3bbf3a4acdbb8fff 100644
--- a/Source/core/html/forms/StepRange.h
+++ b/Source/core/html/forms/StepRange.h
@@ -22,6 +22,7 @@
 #define StepRange_h
 
 #include "platform/Decimal.h"
+#include "wtf/Allocator.h"
 #include "wtf/Forward.h"
 
 namespace blink {
@@ -29,6 +30,7 @@ namespace blink {
 enum AnyStepHandling { RejectAny, AnyIsDefaultStep };
 
 class StepRange {
+    DISALLOW_ALLOCATION();
 public:
     enum StepValueShouldBe {
         StepValueShouldBeReal,
@@ -101,7 +103,7 @@ public:
     }
 
 private:
-    StepRange& operator =(const StepRange&);
+    StepRange& operator=(const StepRange&) = delete;
     Decimal acceptableError() const;
     Decimal roundByStep(const Decimal& value, const Decimal& base) const;