Fix invalid use of int in Zone.

src/typing.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_TYPING_H_
 #define V8_TYPING_H_
 
 #include "src/v8.h"
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/effects.h"
 #include "src/scopes.h"
 #include "src/type-info.h"
 #include "src/types.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 
 
 class AstTyper: public AstVisitor {
  public:
   static void Run(CompilationInfo* info);
 
-  void* operator new(size_t size, Zone* zone) {
-    return zone->New(static_cast<int>(size));
-  }
+  void* operator new(size_t size, Zone* zone) { return zone->New(size); }
   void operator delete(void* pointer, Zone* zone) { }
   void operator delete(void* pointer) { }
 
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
 
  private:
   explicit AstTyper(CompilationInfo* info);
 
   Effect ObservedOnStack(Object* value);
   void ObserveTypesAtOsrEntry(IterationStatement* stmt);
@@ skipping 38 matching lines @@
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node) OVERRIDE;
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
   DISALLOW_COPY_AND_ASSIGN(AstTyper);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TYPING_H_