Reduce the amount of included header files. Vast change like in "Oh God! This...

net/url_request/url_request_simple_job.h

Index: net/url_request/url_request_simple_job.h
===================================================================
--- net/url_request/url_request_simple_job.h	(revision 9942)
+++ net/url_request/url_request_simple_job.h	(working copy)
@@ -2,12 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NET_URL_REQUEST_URL_REQUEST_SIMPLE_JOB_H__
-#define NET_URL_REQUEST_URL_REQUEST_SIMPLE_JOB_H__
+#ifndef NET_URL_REQUEST_URL_REQUEST_SIMPLE_JOB_H_
+#define NET_URL_REQUEST_URL_REQUEST_SIMPLE_JOB_H_
 
-#include "net/url_request/url_request.h"
 #include "net/url_request/url_request_job.h"
 
+class URLRequest;
+
 class URLRequestSimpleJob : public URLRequestJob {
  public:
   URLRequestSimpleJob(URLRequest* request);
@@ -32,5 +33,4 @@
   int data_offset_;
 };
 
-#endif  // NET_URL_REQUEST_URL_REQUEST_DATA_JOB_H__
-
+#endif  // NET_URL_REQUEST_URL_REQUEST_DATA_JOB_H_