Fix a bunch of spelling mistakes :\

src/parser.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 135 matching lines @@
 
 
 bool ParseRegExp(FlatStringReader* input,
                  bool multiline,
                  RegExpCompileData* result);
 
 
 // Support for doing lazy compilation. The script is the script containing full
 // source of the script where the function is declared. The start_position and
 // end_position specifies the part of the script source which has the source
-// for the function decleration in the form:
+// for the function declaration in the form:
 //
 //    (<formal parameters>) { <function body> }
 //
 // without any function keyword or name.
 //
 FunctionLiteral* MakeLazyAST(Handle<Script> script,
                              Handle<String> name,
                              int start_position,
                              int end_position,
                              bool is_expression);
 
 } }  // namespace v8::internal
 
 #endif  // V8_PARSER_H_