Remove support for + prefix in number literals

runtime/vm/scanner_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/os.h"
 #include "vm/scanner.h"
 #include "vm/token.h"
 #include "vm/unit_test.h"
 
@@ skipping 309 matching lines @@
 void NumberLiteral() {
   const Scanner::GrowableTokenStream& tokens =
       Scan("5 0x5d 0.3 0.33 1E+12 .42 +5");
 
   CheckKind(tokens, 0, Token::kINTEGER);
   CheckKind(tokens, 1, Token::kINTEGER);
   CheckKind(tokens, 2, Token::kDOUBLE);
   CheckKind(tokens, 3, Token::kDOUBLE);
   CheckKind(tokens, 4, Token::kDOUBLE);
   CheckKind(tokens, 5, Token::kDOUBLE);
-  CheckKind(tokens, 6, Token::kTIGHTADD);
+  CheckKind(tokens, 6, Token::kADD);
   CheckKind(tokens, 7, Token::kINTEGER);
   CheckKind(tokens, 8, Token::kEOS);
 }
 
 
 void ScanLargeText() {
   const char* dart_source =
       "// This source is not meant to be valid Dart code. The text is used to"
       "// test the Dart scanner."
       ""
@@ skipping 99 matching lines @@
   RawString();
   MultilineString();
   EmptyString();
   EmptyMultilineString();
   NumberLiteral();
   InvalidText();
   FindLineTest();
 }
 
 }  // namespace dart