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

Source/core/html/HTMLDimension.h

Index: Source/core/html/HTMLDimension.h
diff --git a/Source/core/html/HTMLDimension.h b/Source/core/html/HTMLDimension.h
index dbf85046d5858c0dc574a9c46ba5c56da7f4450e..33c0e3c6b7525b81b97a0409f3a3a01bad9caba4 100644
--- a/Source/core/html/HTMLDimension.h
+++ b/Source/core/html/HTMLDimension.h
@@ -32,6 +32,7 @@
 #define HTMLDimension_h
 
 #include "core/CoreExport.h"
+#include "wtf/Allocator.h"
 #include "wtf/Forward.h"
 #include "wtf/Vector.h"
 
@@ -40,6 +41,7 @@ namespace blink {
 // This class corresponds to a dimension as described in HTML5 by the
 // "rules for parsing a list of dimensions" (section 2.4.4.6).
 class HTMLDimension {
+    ALLOW_ONLY_INLINE_ALLOCATION();
 public:
     enum HTMLDimensionType {
         Relative, Percentage, Absolute