Make classes and structures in web fast-allocated.

Source/web/WebEntities.h

Index: Source/web/WebEntities.h
diff --git a/Source/web/WebEntities.h b/Source/web/WebEntities.h
index 5e55247f2004a1e38da694c90c8f04b8e7f67283..b5f4b46c247c7a82763183cfa8bb86a35a8cbddb 100644
--- a/Source/web/WebEntities.h
+++ b/Source/web/WebEntities.h
@@ -31,6 +31,7 @@
 #ifndef WebEntities_h
 #define WebEntities_h
 
+#include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
 #include "wtf/text/WTFString.h"
 
@@ -38,6 +39,7 @@ namespace blink {
 
 // FIXME: This class is wrong and needs to be removed!
 class WebEntities {
+    DISALLOW_ALLOCATION();
 public:
     // ', %, ⊅, &supl; are not defined by the HTML standards.
     //  - IE does not support ' as an HTML entity (but support it as an XML