Remove support for operator negate and replace occurrences with unary

runtime/vm/token.h

 // 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.
 
 #ifndef VM_TOKEN_H_
 #define VM_TOKEN_H_
 
 #include "platform/assert.h"
 
 namespace dart {
@@ skipping 250 matching lines @@
   static int Precedence(Kind tok) {
     ASSERT(tok < kNumTokens);
     return precedence_[tok];
   }
 
   static Attribute Attributes(Kind tok) {
     ASSERT(tok < kNumTokens);
     return attributes_[tok];
   }
 
-  // TODO(hausner): Remove the pseudo keyword 'negate' when old operator
-  // syntax for unary - is removed.
   static bool CanBeOverloaded(Kind tok) {
     ASSERT(tok < kNumTokens);
     return IsRelationalOperator(tok) ||
            (tok == kEQ) ||
            (tok >= kADD && tok <= kMOD) ||  // Arithmetic operations.
            (tok >= kBIT_OR && tok <= kSHR) ||  // Bit operations.
            (tok == kINDEX) ||
-           (tok == kASSIGN_INDEX) ||
-           (tok == kNEGATE);
+           (tok == kASSIGN_INDEX);
   }
 
   static bool NeedsLiteralToken(Kind tok) {
     ASSERT(tok < kNumTokens);
     return ((tok == Token::kINTEGER) ||
             (tok == Token::kSTRING) ||
             (tok == Token::kINTERPOL_VAR) ||
             (tok == Token::kERROR) ||
             (tok == Token::kDOUBLE));
   }
 
   static bool IsBinaryToken(Token::Kind token);
   static bool IsUnaryToken(Token::Kind token);
 
  private:
   static const char* name_[];
   static const char* tok_str_[];
   static const uint8_t precedence_[];
   static const Attribute attributes_[];
 };
 
 
 }  // namespace dart
 
 #endif  // VM_TOKEN_H_