Remove support for interfaces.

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 149 matching lines @@
   KW(kFACTORY, "factory", 0, kPseudoKeyword)                                   \
   KW(kFALSE, "false", 0, kKeyword)                                             \
   KW(kFINAL, "final", 0, kKeyword)                                             \
   KW(kFINALLY, "finally", 0, kKeyword)                                         \
   KW(kFOR, "for", 0, kKeyword)                                                 \
   KW(kGET, "get", 0, kPseudoKeyword)                                           \
   KW(kIF, "if", 0, kKeyword)                                                   \
   KW(kIMPLEMENTS, "implements", 0, kPseudoKeyword)                             \
   KW(kIMPORT, "import", 0, kPseudoKeyword)                                     \
   KW(kIN, "in", 0, kKeyword)                                                   \
-  KW(kINTERFACE, "interface", 0, kPseudoKeyword)                               \
   KW(kIS, "is", 10, kKeyword)                                                  \
   KW(kLIBRARY, "library", 0, kPseudoKeyword)                                   \
   KW(kNEW, "new", 0, kKeyword)                                                 \
   KW(kNULL, "null", 0, kKeyword)                                               \
   KW(kOPERATOR, "operator", 0, kPseudoKeyword)                                 \
   KW(kPART, "part", 0, kPseudoKeyword)                                         \
   KW(kRETURN, "return", 0, kKeyword)                                           \
   KW(kSET, "set", 0, kPseudoKeyword)                                           \
   KW(kSTATIC, "static", 0, kPseudoKeyword)                                     \
   KW(kSUPER, "super", 0, kKeyword)                                             \
@@ skipping 116 matching lines @@
   static const char* name_[];
   static const char* tok_str_[];
   static const uint8_t precedence_[];
   static const Attribute attributes_[];
 };
 
 
 }  // namespace dart
 
 #endif  // VM_TOKEN_H_