Refactorings only: More uses of "To" template and comment fixes.

src/property.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 31 matching lines @@
 //
 
 class Descriptor BASE_EMBEDDED {
  public:
   static int IndexFromValue(Object* value) {
     return Smi::cast(value)->value();
   }
 
   MUST_USE_RESULT MaybeObject* KeyToSymbol() {
     if (!StringShape(key_).IsSymbol()) {
-      Object* result;
-      { MaybeObject* maybe_result = HEAP->LookupSymbol(key_);
-        if (!maybe_result->ToObject(&result)) return maybe_result;
-      }
-      key_ = String::cast(result);
+      MaybeObject* maybe_result = HEAP->LookupSymbol(key_);
+      if (!maybe_result->To(&key_)) return maybe_result;
     }
     return key_;
   }
 
   String* GetKey() { return key_; }
   Object* GetValue() { return value_; }
   PropertyDetails GetDetails() { return details_; }
 
 #ifdef OBJECT_PRINT
   void Print(FILE* out);
@@ skipping 336 matching lines @@
   JSReceiver* holder_;
   int number_;
   bool cacheable_;
   PropertyDetails details_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_PROPERTY_H_