Add request_id to HttpRequestInfo and pass it to the NetworkDelegate for events.

chrome/browser/extensions/extension_webrequest_apitest.cc

 // Copyright (c) 2010 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.
 
 #include "base/command_line.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/common/chrome_switches.h"
+#include "net/base/mock_host_resolver.h"
 
-IN_PROC_BROWSER_TEST_F(ExtensionApiTest, WebRequest) {
+class ExtensionWebRequestApiTest : public ExtensionApiTest {
+ public:
+  virtual void SetUpInProcessBrowserTestFixture() {
+    ExtensionApiTest::SetUpInProcessBrowserTestFixture();
+    host_resolver()->AddRule("*", "127.0.0.1");
+    ASSERT_TRUE(StartTestServer());
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest, WebRequest) {
   CommandLine::ForCurrentProcess()->AppendSwitch(
       switches::kEnableExperimentalExtensionApis);
 
   ASSERT_TRUE(RunExtensionTest("webrequest/api")) << message_;
 }
 
-IN_PROC_BROWSER_TEST_F(ExtensionApiTest, WebRequestEvents) {
+IN_PROC_BROWSER_TEST_F(ExtensionWebRequestApiTest, WebRequestEvents) {
   CommandLine::ForCurrentProcess()->AppendSwitch(
     switches::kEnableExperimentalExtensionApis);
 
   ASSERT_TRUE(RunExtensionTest("webrequest/events")) << message_;
 }