Bug 1190921 - Broadcastchannel keeps its containing iframe in memory when it has a user defined property, r=khuey

dom/broadcastchannel/BroadcastChannel.cpp

@@ -654,10 +654,6 @@ BroadcastChannel::Observe(nsISupports* aSubject, const char* aTopic,
 
   // If the window is destroyed we have to release the reference that we are
   // keeping.
-  if (!mIsKeptAlive) {
-    return NS_OK;
-  }
-
   nsCOMPtr<nsISupportsPRUint64> wrapper = do_QueryInterface(aSubject);
   NS_ENSURE_TRUE(wrapper, NS_ERROR_FAILURE);
 

dom/broadcastchannel/tests/test_broadcastchannel_basic.html

@@ -52,6 +52,11 @@ function runTest() {
   function iframeLoaded() {
     bc.postMessage("Hello world from the window!");
   }
+
+  // A leak test
+  var dummyBc = new BroadcastChannel("dont_leak_this");
+  dummyBc.foo = "bar";
+  // don't add message listener!
 }
 
 SimpleTest.waitForExplicitFinish();