Another try at appendHtml and insertAdjacentHtml should be consistently sanitized

CHANGELOG.md

 ## 1.11.0
 
 ### Core library changes
 
+* In dart:html, appendHtml and insertAdjacentHtml now take validator
+  and treeSanitizer parameters, and the inputs are consistently sanitized.
+* List iterators may not throw ConcurrentModificationError as eagerly in
+  release mode. In checked mode, the modification check is still as eager
+  as possible.
+  [r45198](https://code.google.com/p/dart/source/detail?r=45198),
+* Update experimental Isolate API:
+  - Make priority parameters of `Isolate.ping` and `Isolate.kill` methods
 * `dart:core`
   * Add `unmodifiable` constructor to `List` -
     [r45334](https://code.google.com/p/dart/source/detail?r=45334)
 * `dart:isolate` *Experimental*
   * Make the `priority` parameter of `Isolate.ping` and `Isolate.kill` methods
     a named parameter.
   * Remove the `Isolate.AS_EVENT` priority.
   * Add extra `response` parameter to `Isolate.ping` and
     `Isolate.addOnExitListener` -
     [r45092](https://code.google.com/p/dart/source/detail?r=45092)
@@ skipping 269 matching lines @@
     they will keep the Dart process alive until they time out. This fixes the
     handling of persistent connections. Previously, the client would shut down
     immediately after a request.
 
   * **Breaking change:** `HttpServer` no longer compresses all traffic by
     default. The new `autoCompress` property can be set to `true` to re-enable
     compression.
 
 * `dart:isolate`: `Isolate.spawnUri` added the optional `packageRoot` argument,
   which controls how it resolves `package:` URIs.