Deprecate chrome.extension.sendRequest in favor of sendMessage, with a safer

chrome/renderer/resources/extensions/extension_custom_bindings.js

Index: chrome/renderer/resources/extensions/extension_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/extension_custom_bindings.js b/chrome/renderer/resources/extensions/extension_custom_bindings.js
index 970e11f9ad24286b379e657737277aee15118618..66603532d1a5c6c61960ea1495db7fd001157d27 100644
--- a/chrome/renderer/resources/extensions/extension_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/extension_custom_bindings.js
@@ -52,7 +52,7 @@ chromeHidden.registerCustomHook('extension',
     return 'chrome-extension://' + extensionId + path;
   });
 
-  apiFunctions.setUpdateArgumentsPreValidate('sendRequest', function() {
+  function sendMessageUpdateArguments() {
     // Align missing (optional) function arguments with the arguments that
     // schema validation is expecting, e.g.
     //   extension.sendRequest(req)     -> extension.sendRequest(null, req)
@@ -73,38 +73,26 @@ chromeHidden.registerCustomHook('extension',
       targetId = arguments[lastArg--];
 
     if (lastArg != -1)
-      throw new Error('Invalid arguments to sendRequest.');
+      throw new Error('Invalid arguments to sendMessage.');
     return [targetId, request, responseCallback];
-  });
+  }
+  apiFunctions.setUpdateArgumentsPreValidate('sendRequest',
+                                             sendMessageUpdateArguments);
+  apiFunctions.setUpdateArgumentsPreValidate('sendMessage',
+                                             sendMessageUpdateArguments);
 
   apiFunctions.setHandleRequest('sendRequest',
                                 function(targetId, request, responseCallback) {
-    if (!targetId)
-      targetId = extensionId;
-    if (!responseCallback)
-      responseCallback = function() {};
-
-    var connectInfo = { name: chromeHidden.kRequestChannel };
-    var port = chrome.extension.connect(targetId, connectInfo);
-
-    port.postMessage(request);
-    port.onDisconnect.addListener(function() {
-      // For onDisconnects, we only notify the callback if there was an error
-      try {
-        if (chrome.extension.lastError)
-          responseCallback();
-      } finally {
-        port = null;
-      }
-    });
-    port.onMessage.addListener(function(response) {
-      try {
-        responseCallback(response);
-      } finally {
-        port.disconnect();
-        port = null;
-      }
-    });
+    var port = chrome.extension.connect(targetId || extensionId,
+                                        {name: chromeHidden.kRequestChannel});
+    chromeHidden.Port.sendMessageImpl(port, request, responseCallback);
+  });
+
+  apiFunctions.setHandleRequest('sendMessage',
+                                function(targetId, message, responseCallback) {
+    var port = chrome.extension.connect(targetId || extensionId,
+                                        {name: chromeHidden.kMessageChannel});
+    chromeHidden.Port.sendMessageImpl(port, message, responseCallback);
   });
 
   apiFunctions.setUpdateArgumentsPreValidate('connect', function() {