Mock the LinkDoctor for tests. Should greatly decrease ErrorPage test flakiness.

chrome/browser/net/url_request_mock_link_doctor_job.h

Index: chrome/browser/net/url_request_mock_link_doctor_job.h
diff --git a/chrome/browser/net/url_request_mock_link_doctor_job.h b/chrome/browser/net/url_request_mock_link_doctor_job.h
new file mode 100644
index 0000000000000000000000000000000000000000..74fd00ef75adea48e2fd3c4fcc4b43282bb8cf34
--- /dev/null
+++ b/chrome/browser/net/url_request_mock_link_doctor_job.h
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+// Copyright (c) 2009 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.
+//
+// A URLRequestJob class that substitutes LinkDoctor requests.
+
+#ifndef CHROME_BROWSER_NET_URL_REQUEST_MOCK_LINK_DOCTOR_JOB_H_
+#define CHROME_BROWSER_NET_URL_REQUEST_MOCK_LINK_DOCTOR_JOB_H_
+
+#include "chrome/browser/net/url_request_mock_http_job.h"
+
+class URLRequestMockLinkDoctorJob : public URLRequestMockHTTPJob {
+ public:
+  URLRequestMockLinkDoctorJob(URLRequest* request);
+  virtual ~URLRequestMockLinkDoctorJob() { }
+
+  static URLRequest::ProtocolFactory Factory;
+
+  // Adds the testing URLs to the URLRequestFilter.
+  static void AddUrlHandler();
+};
+
+# endif  // CHROME_BROWSER_NET_URL_REQUEST_MOCK_LINK_DOCTOR_JOB_H_