[ios] Cleaned up UIWebView workarounds from window_id.js.

ios/web/web_state/js/resources/window_id.js

Index: ios/web/web_state/js/resources/window_id.js
diff --git a/ios/web/web_state/js/resources/window_id.js b/ios/web/web_state/js/resources/window_id.js
index 8935d8024bb28d5cb03cab1018ae0b727b0193e2..a9e9b9ee2d17c87116f8c20d0fcb69ece1ffe211 100644
--- a/ios/web/web_state/js/resources/window_id.js
+++ b/ios/web/web_state/js/resources/window_id.js
@@ -12,20 +12,10 @@
 __gCrWeb['windowIdObject'] = {};
 
 (function() {
-  // CRWJSWindowIdManager replaces $(WINDOW_ID) with appropriate string upon
+  // CRWJSWindowIDManager replaces $(WINDOW_ID) with appropriate string upon
   // injection.
   __gCrWeb['windowId'] = '$(WINDOW_ID)';
 
-  // Wrap queues flushing in setTimeout to avoid reentrant calls.
-  // In some circumstances setTimeout does not work on iOS8 if set from
-  // injected script. There is an assumption that it's happen when the script
-  // has been injected too early. Do not place anything important to delayed
-  // function body, since there is no guarantee that it will ever be executed.
-  // TODO(eugenebut): Find out why setTimeout does not work (crbug.com/402682).
-  window.setTimeout(function() {
-    // Send messages queued since message.js injection.
-    if (__gCrWeb.message) {
-      __gCrWeb.message.invokeQueues();
-    }
-  }, 0);
+  // Send messages queued since message.js injection.
+  __gCrWeb.message.invokeQueues();
 }());