Delete dart2js specific private library code

lib/runtime/dart/_js_names.js

-var _js_names = dart.defineLibrary(_js_names, {});
-var _foreign_helper = dart.lazyImport(_foreign_helper);
-var _js_embedded_names = dart.import(_js_embedded_names);
-var core = dart.import(core);
-var _interceptors = dart.import(_interceptors);
-var _js_helper = dart.lazyImport(_js_helper);
-(function(exports, _foreign_helper, _js_embedded_names, core, _interceptors, _js_helper) {
-  'use strict';
-  function preserveNames() {
-  }
-  dart.fn(preserveNames);
-  dart.defineLazyProperties(exports, {
-    get mangledNames() {
-      return computeMangledNames(_foreign_helper.JS_EMBEDDED_GLOBAL('=Object', _js_embedded_names.MANGLED_NAMES), false);
-    },
-    get reflectiveNames() {
-      return computeReflectiveNames(exports.mangledNames);
-    },
-    get mangledGlobalNames() {
-      return computeMangledNames(_foreign_helper.JS_EMBEDDED_GLOBAL('=Object', _js_embedded_names.MANGLED_GLOBAL_NAMES), true);
-    },
-    get reflectiveGlobalNames() {
-      return computeReflectiveNames(exports.mangledGlobalNames);
-    }
-  });
-  function computeMangledNames(jsMangledNames, isGlobal) {
-    preserveNames();
-    let keys = extractKeys(jsMangledNames);
-    let result = dart.map();
-    let getterPrefix = _foreign_helper.JS_GET_NAME('GETTER_PREFIX');
-    let getterPrefixLength = getterPrefix.length;
-    let setterPrefix = _foreign_helper.JS_GET_NAME('SETTER_PREFIX');
-    for (let key of dart.as(keys, core.Iterable$(core.String))) {
-      let value = jsMangledNames[key];
-      result.set(key, value);
-      if (!dart.notNull(isGlobal)) {
-        if (key[dartx.startsWith](getterPrefix)) {
-          result.set(`${setterPrefix}${key[dartx.substring](getterPrefixLength)}`, `${value}=`);
-        }
-      }
-    }
-    return result;
-  }
-  dart.fn(computeMangledNames, core.Map$(core.String, core.String), [core.Object, core.bool]);
-  function computeReflectiveNames(map) {
-    preserveNames();
-    let result = dart.map();
-    map.forEach(dart.fn((mangledName, reflectiveName) => {
-      result.set(reflectiveName, mangledName);
-    }, core.Object, [core.String, core.String]));
-    return result;
-  }
-  dart.fn(computeReflectiveNames, core.Map$(core.String, core.String), [core.Map$(core.String, core.String)]);
-  function extractKeys(victim) {
-    let result = function(victim, hasOwnProperty) {
-      var result = [];
-      for (var key in victim) {
-        if (hasOwnProperty.call(victim, key))
-          result.push(key);
-      }
-      return result;
-    }(victim, Object.prototype.hasOwnProperty);
-    return _interceptors.JSArray.markFixed(result);
-  }
-  dart.fn(extractKeys, core.List, [core.Object]);
-  function unmangleGlobalNameIfPreservedAnyways(name) {
-    let names = _foreign_helper.JS_EMBEDDED_GLOBAL('=Object', _js_embedded_names.MANGLED_GLOBAL_NAMES);
-    return dart.as(_js_helper.JsCache.fetch(names, name), core.String);
-  }
-  dart.fn(unmangleGlobalNameIfPreservedAnyways, core.String, [core.String]);
-  function unmangleAllIdentifiersIfPreservedAnyways(str) {
-    return str.replace(/[^<,> ]+/g, function(m) {
-      return _foreign_helper.JS_EMBEDDED_GLOBAL('', _js_embedded_names.MANGLED_GLOBAL_NAMES)[m] || m;
-    });
-  }
-  dart.fn(unmangleAllIdentifiersIfPreservedAnyways, core.String, [core.String]);
-  // Exports:
-  exports.preserveNames = preserveNames;
-  exports.computeMangledNames = computeMangledNames;
-  exports.computeReflectiveNames = computeReflectiveNames;
-  exports.extractKeys = extractKeys;
-  exports.unmangleGlobalNameIfPreservedAnyways = unmangleGlobalNameIfPreservedAnyways;
-  exports.unmangleAllIdentifiersIfPreservedAnyways = unmangleAllIdentifiersIfPreservedAnyways;
-})(_js_names, _foreign_helper, _js_embedded_names, core, _interceptors, _js_helper);