Revert 186643 - Caused a 10% regression on SunSpider benchmark

chrome/renderer/resources/extensions/send_request.js

Index: chrome/renderer/resources/extensions/send_request.js
===================================================================
--- chrome/renderer/resources/extensions/send_request.js	(revision 186747)
+++ chrome/renderer/resources/extensions/send_request.js	(working copy)
@@ -3,41 +3,25 @@
 // found in the LICENSE file.
 
 var chromeHidden = requireNative('chrome_hidden').GetChromeHidden();
-var DCHECK = requireNative('logging').DCHECK;
 var json = require('json');
 var lastError = require('lastError');
 var natives = requireNative('sendRequest');
 var validate = require('schemaUtils').validate;
 
-// All outstanding requests from sendRequest().
-var requests = {};
-
 // Callback handling.
+var requests = [];
 chromeHidden.handleResponse = function(requestId, name,
                                        success, responseList, error) {
-  // The chrome objects we will set lastError on. Really we should only be
-  // setting this on the callback's chrome object, but set on ours too since
-  // it's conceivable that something relies on that.
-  var chromesForLastError = [chrome];
-
   try {
     var request = requests[requestId];
-    DCHECK(request != null);
-
-    // lastError needs to be set on the caller's chrome object no matter what,
-    // though chances are it's the same as ours (it will be different when
-    // calling API methods on other contexts).
-    if (request.callback) {
-      var chromeForCallback = natives.GetGlobal(request.callback).chrome;
-      if (chromeForCallback != chrome)
-        chromesForLastError.push(chromeForCallback);
-    }
-
-    chromesForLastError.forEach(function(c) {lastError.clear(c)});
-    if (!success) {
-      if (!error)
+    if (success) {
+      lastError.clear();
+    } else {
+      if (!error) {
         error = "Unknown error.";
-      chromesForLastError.forEach(function(c) {lastError.set(error, c)});
+      }
+      console.error("Error during " + name + ": " + error);
+      lastError.set(error);
     }
 
     if (request.customCallback) {
@@ -48,7 +32,7 @@
     if (request.callback) {
       // Validate callback in debug only -- and only when the
       // caller has provided a callback. Implementations of api
-      // calls may not return data if they observe the caller
+      // calls my not return data if they observe the caller
       // has not provided a callback.
       if (chromeHidden.validateCallbacks && !error) {
         try {
@@ -67,8 +51,10 @@
     }
   } finally {
     delete requests[requestId];
-    chromesForLastError.forEach(function(c) {lastError.clear(c)});
+    lastError.clear();
   }
+
+  return undefined;
 };
 
 function prepareRequest(args, argSchemas) {
@@ -123,7 +109,6 @@
   var requestId = natives.GetNextRequestId();
   request.id = requestId;
   requests[requestId] = request;
-
   var hasCallback = request.callback || optArgs.customCallback;
   return nativeFunction(functionName,
                         requestArgs,