Remove tolerantParse workaround from parser.js.

Now that @babel/parser@7.5.0 is out, we no longer need to simulate the
effect of babel/babel#9864.

See also benjamn/reify#230.

parser.js

@@ -1,30 +1,10 @@
 "use strict";
 
 const babelParser = require("@babel/parser");
-const babelParserVersion = require("@babel/parser/package.json").version;
 const defaultParserOptions = require("reify/lib/parsers/babel.js").options;
 
 function parse(code, parserOptions) {
   return babelParser.parse(code, parserOptions || defaultParserOptions);
 }
 
-function tolerantParse(code, parserOptions) {
-  const arrayFrom = Array.from;
-  // There is only one use of Array.from in the @babel/parser@7.4.x code,
-  // Array.from(this.scope.undefinedExports), which determines whether the
-  // parser complains prematurely about exporting identifiers that were
-  // not declared in the current module scope. By returning an empty array
-  // when the source argument is a Map, we can effectively disable that
-  // error behavior, until https://github.com/babel/babel/pull/9864 is
-  // released in @babel/parser@7.5.0.
-  Array.from = function (source) {
-    return source instanceof Map ? [] : arrayFrom.apply(this, arguments);
-  };
-  try {
-    return parse(code, parserOptions);
-  } finally {
-    Array.from = arrayFrom;
-  }
-}
-
-exports.parse = babelParserVersion.startsWith("7.4.") ? tolerantParse : parse;
+exports.parse = parse;