Fix small memory leak in new serialization code.

src/bootstrapper.h

 // 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 62 matching lines @@
   static int ArchiveSpacePerThread();
   static char* ArchiveState(char* to);
   static char* RestoreState(char* from);
   static void FreeThreadResources();
 };
 
 
 class NativesExternalStringResource
     : public v8::String::ExternalAsciiStringResource {
  public:
-  explicit NativesExternalStringResource(const char* source)
-      : data_(source), length_(strlen(source)) { }
+  explicit NativesExternalStringResource(const char* source);
 
   const char* data() const {
     return data_;
   }
 
   size_t length() const {
     return length_;
   }
  private:
   const char* data_;
   size_t length_;
 };
 
 }}  // namespace v8::internal
 
 #endif  // V8_BOOTSTRAPPER_H_