refactor emitMemberName to be used more consistently

lib/runtime/dart/convert.js

 var convert;
 (function(exports) {
   'use strict';
   let ASCII = new AsciiCodec();
   let _ASCII_MASK = 127;
   let _allowInvalid = Symbol('_allowInvalid');
   let _nameToEncoding = Symbol('_nameToEncoding');
   let Codec$ = dart.generic(function(S, T) {
     class Codec extends core.Object {
       Codec() {
@@ skipping 509 matching lines @@
       this.mode = mode;
       super.Converter();
     }
     convert(text) {
       let val = this[_convert](text, 0, text.length);
       return val == null ? text : val;
     }
     [_convert](text, start, end) {
       let result = null;
       for (let i = start; dart.notNull(i) < dart.notNull(end); i = dart.notNull(i) + 1) {
-        let ch = text.get(i);
+        let ch = core.String.get(text, i);
         let replace = null;
         switch (ch) {
           case '&':
           {
             replace = '&amp;';
             break;
           }
           case ' ':
           {
             replace = '&nbsp;';
@@ skipping 1893 matching lines @@
   exports.LineSplitter = LineSplitter;
   exports.StringConversionSink = StringConversionSink;
   exports.ClosableStringSink = ClosableStringSink;
   exports.UNICODE_REPLACEMENT_CHARACTER_RUNE = UNICODE_REPLACEMENT_CHARACTER_RUNE;
   exports.UNICODE_BOM_CHARACTER_RUNE = UNICODE_BOM_CHARACTER_RUNE;
   exports.UTF8 = UTF8;
   exports.Utf8Codec = Utf8Codec;
   exports.Utf8Encoder = Utf8Encoder;
   exports.Utf8Decoder = Utf8Decoder;
 })(convert || (convert = {}));