Fix creates value for getStats

It looks like it must match to Dart type, which has a different case
than JS type.

Change-Id: I485ef41d200fb689dd987edc757f3fcb7138ab90
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/161481
Auto-Submit: Ivan Inozemtsev <iinozemtsev@google.com>
Commit-Queue: Ivan Inozemtsev <iinozemtsev@google.com>
Commit-Queue: David Morgan <davidmorgan@google.com>
Reviewed-by: David Morgan <davidmorgan@google.com>

Author: iinozemtsev

sdk/lib/html/dart2js/html_dart2js.dart

@@ -27002,7 +27002,7 @@ class RtcPeerConnection extends EventTarget {
   List<RtcRtpSender> getSenders() native;
 
   Future<RtcStatsReport> getStats() => promiseToFuture<RtcStatsReport>(
-      JS("creates:RTCStatsReport;", "#.getStats()", this));
+      JS("creates:RtcStatsReport;", "#.getStats()", this));
 
   void removeStream(MediaStream? stream) native;
 

tools/dom/scripts/systemhtml.py

@@ -1054,7 +1054,7 @@ def _DartType(self, type_name):
         "RTCPeerConnection.getStats": {
             "type": "RtcStatsReport",
             "maplike": "RTCStatsReport",
-            "creates": "RTCStatsReport"
+            "creates": "RtcStatsReport"
         },
         "RTCPeerConnection.generateCertificate": {
             "type": "RtcCertificate",