Remove unused private member variables found by clang -Wunused-private-field

src/parser.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 78 matching lines @@
     ASSERT(backing_[kLanguageModeIndex] == CLASSIC_MODE ||
            backing_[kLanguageModeIndex] == STRICT_MODE ||
            backing_[kLanguageModeIndex] == EXTENDED_MODE);
     return static_cast<LanguageMode>(backing_[kLanguageModeIndex]);
   }
 
   bool is_valid() { return !backing_.is_empty(); }
 
  private:
   Vector<unsigned> backing_;
-  bool owns_data_;
 };
 
 
 class ScriptDataImpl : public ScriptData {
  public:
   explicit ScriptDataImpl(Vector<unsigned> store)
       : store_(store),
         owns_store_(true) { }
 
   // Create an empty ScriptDataImpl that is guaranteed to not satisfy
@@ skipping 768 matching lines @@
  private:
   static const int kTypeSlot = 0;
   static const int kElementsSlot = 1;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(CompileTimeValue);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_