Use iterator, moveNext(), current.

runtime/lib/string_base.dart

Index: runtime/lib/string_base.dart
diff --git a/runtime/lib/string_base.dart b/runtime/lib/string_base.dart
index 880df42323ee66a6cc7c0649b27f7355c63fcdba..eef5b02a47d363fdcf73089036c762d77ce49f81 100644
--- a/runtime/lib/string_base.dart
+++ b/runtime/lib/string_base.dart
@@ -189,7 +189,7 @@ class _StringBase {
     if (pattern is String) {
       return indexOf(pattern, startIndex) >= 0;
     }
-    return pattern.allMatches(this.substring(startIndex)).iterator().hasNext;
+    return pattern.allMatches(this.substring(startIndex)).iterator.moveNext();
   }
 
   String replaceFirst(Pattern pattern, String replacement) {
@@ -201,9 +201,9 @@ class _StringBase {
     }
     StringBuffer buffer = new StringBuffer();
     int startIndex = 0;
-    Iterator iterator = pattern.allMatches(this).iterator();
-    if (iterator.hasNext) {
-      Match match = iterator.next();
+    Iterator iterator = pattern.allMatches(this).iterator;
+    if (iterator.moveNext()) {
+      Match match = iterator.current;
       buffer.add(this.substring(startIndex, match.start)).add(replacement);
       startIndex = match.end;
     }
@@ -280,8 +280,8 @@ class _StringBase {
 
   List<String> split(Pattern pattern) {
     int length = this.length;
-    Iterator iterator = pattern.allMatches(this).iterator();
-    if (length == 0 && iterator.hasNext) {
+    Iterator iterator = pattern.allMatches(this).iterator;
+    if (length == 0 && iterator.moveNext()) {
       // A matched empty string input returns the empty list.
       return <String>[];
     }
@@ -289,11 +289,11 @@ class _StringBase {
     int startIndex = 0;
     int previousIndex = 0;
     while (true) {
-      if (startIndex == length || !iterator.hasNext) {
+      if (startIndex == length || !iterator.moveNext()) {
         result.add(this.substring(previousIndex, length));
         break;
       }
-      Match match = iterator.next();
+      Match match = iterator.current;
       if (match.start == length) {
         result.add(this.substring(previousIndex, length));
         break;