Revert "Fix extension bindings injection for iframes"

chrome/test/data/extensions/api_test/bindings/external_message_listener/background.js

Index: chrome/test/data/extensions/api_test/bindings/external_message_listener/background.js
diff --git a/chrome/test/data/extensions/api_test/bindings/external_message_listener/background.js b/chrome/test/data/extensions/api_test/bindings/external_message_listener/background.js
deleted file mode 100644
index b5dce1a7af70ffca58036d0f7f64c5721e83245f..0000000000000000000000000000000000000000
--- a/chrome/test/data/extensions/api_test/bindings/external_message_listener/background.js
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-var messagesReceived = [];
-
-// Have we received the real message from the sender extension?
-var receivedRealSenderMessage = false;
-
-// Has the c++ code in the browser test asked us for the total count of messages
-// we've received?
-var sendCountAfterSenderMessage = false;
-
-function getMessageCountAfterReceivingRealSenderMessage() {
-  if (receivedRealSenderMessage) {
-    window.domAutomationController.send(messagesReceived.length);
-  } else {
-    sendCountAfterSenderMessage = true;
-  }
-}
-
-chrome.runtime.onMessageExternal.addListener(function(msg, sender, respond) {
-  messagesReceived.push({msg:msg, sender:sender});
-  if (msg == 'from_sender') {
-    receivedRealSenderMessage = true;
-    if (sendCountAfterSenderMessage) {
-      window.domAutomationController.send(messagesReceived.length);
-    }
-  }
-});
-
-chrome.test.sendMessage('receiver_ready');