Revert "js_runtime: streamline stringReplaceAllUnchecked"

tests/corelib/string_replace_all_test.dart

 // 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.
 
 import "package:expect/expect.dart";
 
 testReplaceAll() {
   Expect.equals(
       "aXXcaXXdae", "abcabdae".replaceAll("b", "XX"));
 
@@ skipping 28 matching lines @@
   // Test replacing by the empty string.
   Expect.equals(
       "bcbde", "abcabdae".replaceAll("a", ""));
   Expect.equals("AB", "AfromB".replaceAll("from", ""));
 
   // Test changing the empty string.
   Expect.equals("to", "".replaceAll("", "to"));
 
   // Test replacing the empty string.
   Expect.equals("toAtoBtoCto", "ABC".replaceAll("", "to"));
-
-  // Pattern strings containing RegExp metacharacters - these are not
-  // interpreted as RegExps.
-  Expect.equals(r"$$", "||".replaceAll("|", r"$"));
-  Expect.equals(r"$$$$", "||".replaceAll("|", r"$$"));
-  Expect.equals(r"x$|x", "x|.|x".replaceAll("|.", r"$"));
-  Expect.equals(r"$$", "..".replaceAll(".", r"$"));
-  Expect.equals(r"[$$$$]", "[..]".replaceAll(".", r"$$"));
-  Expect.equals(r"[$]", "[..]".replaceAll("..", r"$"));
-  Expect.equals(r"$$", r"\\".replaceAll(r"\", r"$"));
 }
 
 testReplaceAllMapped() {
   String mark(Match m) => "[${m[0]}]";
   Expect.equals(
       "a[b]ca[b]dae", "abcabdae".replaceAllMapped("b", mark));
 
   // Test with the replaced string at the begining.
   Expect.equals(
       "[a]bc[a]bd[a]e", "abcabdae".replaceAllMapped("a", mark));
@@ skipping 81 matching lines @@
       "<>a<bc>a<bd>a<e>",
       "abcabdae".splitMapJoin("a", onNonMatch: wrap));
 
 }
 
 main() {
   testReplaceAll();
   testReplaceAllMapped();
   testSplitMapJoin();
 }