Remove the LookupResult IsValid method because it is confusing....

src/property.cc

 // Copyright 2006-2008 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 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include "v8.h"
 
 namespace v8 {
 namespace internal {
 
 
 #ifdef DEBUG
 void LookupResult::Print() {
-  if (!IsValid()) {
+  if (!IsFound()) {
     PrintF("Not Found\n");
     return;
   }
 
   PrintF("LookupResult:\n");
   PrintF(" -cacheable = %s\n", IsCacheable() ? "true" : "false");
   PrintF(" -attributes = %x\n", GetAttributes());
   switch (type()) {
     case NORMAL:
       PrintF(" -type = normal\n");
@@ skipping 40 matching lines @@
   PrintF(" @ ");
   GetValue()->ShortPrint();
   PrintF(" %d\n", GetDetails().index());
 }
 
 
 #endif
 
 
 } }  // namespace v8::internal