sdk/lib/html/dartium/html_dartium.dart

Index: sdk/lib/html/dartium/html_dartium.dart
diff --git a/sdk/lib/html/dartium/html_dartium.dart b/sdk/lib/html/dartium/html_dartium.dart
index 431511acecd016f7d2677189d30f4af4cda02245..27ced8bda4bc4f38e7e0ccbed34614982e79340b 100644
--- a/sdk/lib/html/dartium/html_dartium.dart
+++ b/sdk/lib/html/dartium/html_dartium.dart
@@ -33354,9 +33354,7 @@ class _EventStreamSubscription<T extends Event> extends StreamSubscription<T> {
   }
 
   void cancel() {
-    if (_canceled) {
-      throw new StateError("Subscription has been canceled.");
-    }
+    if (_canceled) return;
 
     _unlisten();
     // Clear out the target to indicate this is complete.
@@ -33384,9 +33382,7 @@ class _EventStreamSubscription<T extends Event> extends StreamSubscription<T> {
   void onDone(void handleDone()) {}
 
   void pause([Future resumeSignal]) {
-    if (_canceled) {
-      throw new StateError("Subscription has been canceled.");
-    }
+    if (_canceled) return;
     ++_pauseCount;
     _unlisten();
 
@@ -33398,12 +33394,7 @@ class _EventStreamSubscription<T extends Event> extends StreamSubscription<T> {
   bool get _paused => _pauseCount > 0;
 
   void resume() {
-    if (_canceled) {
-      throw new StateError("Subscription has been canceled.");
-    }
-    if (!_paused) {
-      throw new StateError("Subscription is not paused.");
-    }
+    if (_canceled || !_paused) return;
     --_pauseCount;
     _tryResume();
   }