Fix memory leak from sample/shell.cc.

samples/shell.cc

 // Copyright 2011 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 77 matching lines @@
   SourceGroup() :
 #if !(defined(USING_V8_SHARED) || defined(V8_SHARED))
                   next_semaphore_(v8::internal::OS::CreateSemaphore(0)),
                   done_semaphore_(v8::internal::OS::CreateSemaphore(0)),
                   thread_(NULL),
 #endif  // USING_V8_SHARED
                   argv_(NULL),
                   begin_offset_(0),
                   end_offset_(0) { }
 
+  ~SourceGroup() {
+    delete next_semaphore_;
+    delete done_semaphore_;
+  }
+
   void Begin(char** argv, int offset) {
     argv_ = const_cast<const char**>(argv);
     begin_offset_ = offset;
   }
 
   void End(int offset) { end_offset_ = offset; }
 
   void Execute() {
     for (int i = begin_offset_; i < end_offset_; ++i) {
       const char* arg = argv_[i];
@@ skipping 596 matching lines @@
       printf("^");
     }
     printf("\n");
     v8::String::Utf8Value stack_trace(try_catch->StackTrace());
     if (stack_trace.length() > 0) {
       const char* stack_trace_string = ToCString(stack_trace);
       printf("%s\n", stack_trace_string);
     }
   }
 }