Remove __gCrWeb.invokeOnHostImmediate.

ios/web/web_state/js/resources/core.js

Index: ios/web/web_state/js/resources/core.js
diff --git a/ios/web/web_state/js/resources/core.js b/ios/web/web_state/js/resources/core.js
index 3ceb27f234b277ee69979d42a8a05d05d0a7907d..42fd71be2e0c66a3c0e77a568625a26402108852 100644
--- a/ios/web/web_state/js/resources/core.js
+++ b/ios/web/web_state/js/resources/core.js
@@ -339,10 +339,6 @@ goog.require('__crWeb.message');
     __gCrWeb.message.invokeOnHost(command);
   };
 
-  function invokeOnHostImmediate_(command) {
-    __gCrWeb.message.invokeOnHostImmediate(command);
-  };
-
   /**
    * Gets the referrer policy to use for navigations away from the current page.
    * If a link element is passed, and it includes a rel=noreferrer tag, that
@@ -546,6 +542,10 @@ goog.require('__crWeb.message');
   };
 
   var setExternalRequest_ = function(href, target) {
+    // If there is no document or body, the request will be silently dropped

[Eugene But (OOO till 7-30), 2016/09/20 22:05:14]

Do you even need this comment? It simply repeats the code and not helping with
anything.

+    // here.
+    if (!document || !document.body)
+      return;
     if (typeof(target) == 'undefined' || target == '_blank' || target == '') {
       target = '' + Date.now() + '-' + Math.random();
     }
@@ -553,15 +553,10 @@ goog.require('__crWeb.message');
       // W3C recommended behavior.
       href = 'about:blank';
     }
-    // ExternalRequest messages need to be handled before the expected
-    // shouldStartLoadWithRequest, as such we cannot wait for the regular
-    // message queue invoke which delays to avoid illegal recursion into
-    // UIWebView. This immediate class of messages is handled ASAP by
-    // CRWWebController.
-    invokeOnHostImmediate_({'command': 'externalRequest',
-                               'href': href,
-                             'target': target,
-                     'referrerPolicy': getReferrerPolicy_()});
+    invokeOnHost_({'command': 'externalRequest',
+                      'href': href,
+                    'target': target,
+            'referrerPolicy': getReferrerPolicy_()});
   };
 
   var resetExternalRequest_ = function() {