Changed interface to preparser to not require pushback support.

src/scanner-base.cc

 // Copyright 2010 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 494 matching lines @@
   ASSERT(pos >= current_pos);
   if (pos != current_pos) {
     source_->SeekForward(pos - source_->pos());
     Advance();
     // This function is only called to seek to the location
     // of the end of a function (at the "}" token). It doesn't matter
     // whether there was a line terminator in the part we skip.
     has_line_terminator_before_next_ = false;
   }
   Scan();
-  ASSERT_EQ(Token::RBRACE, next_.token);
 }
 
 
 void JavaScriptScanner::ScanEscape() {
   uc32 c = c0_;
   Advance();
 
   // Skip escaped newlines.
   if (ScannerConstants::kIsLineTerminator.get(c)) {
     // Allow CR+LF newlines in multiline string literals.
@@ skipping 391 matching lines @@
       if (MatchKeywordStart(input, "with", 1, Token::WITH)) return;
       break;
     case UNMATCHABLE:
       break;
   }
   // On fallthrough, it's a failure.
   state_ = UNMATCHABLE;
 }
 
 } }  // namespace v8::internal