Remove last vestigates of #_hasSymbol

Author: DougGregor

gyb_syntax_support/StmtNodes.py

@@ -185,7 +185,6 @@
                              kind='MatchingPatternCondition'),
                        Child('OptionalBinding',
                              kind='OptionalBindingCondition'),
-                       Child('HasSymbol', kind='HasSymbolCondition'),
                    ]),
              Child('TrailingComma', kind='CommaToken',
                    is_optional=True),
@@ -222,16 +221,6 @@
                    is_optional=True),
          ]),
 
-    # has-symbol-condition -> '#_hasSymbol' '(' expression ')'
-    Node('HasSymbolCondition', name_for_diagnostics="'#_hasSymbol' condition",
-         kind='Syntax',
-         children=[
-             Child('HasSymbolKeyword', kind='HasSymbolToken'),
-             Child('LeftParen', kind='LeftParenToken'),
-             Child('Expression', kind='Expr'),
-             Child('RightParen', kind='RightParenToken'),
-         ]),
-          
     # condition-list -> condition
     #                 | condition ','? condition-list
     Node('ConditionElementList', name_for_diagnostics=None, kind='SyntaxCollection',