iwyu: Cleanup in the following files:

chrome/browser/autofill/autofill_download.h

Index: chrome/browser/autofill/autofill_download.h
diff --git a/chrome/browser/autofill/autofill_download.h b/chrome/browser/autofill/autofill_download.h
index 65c9206ce02a47b9fe66c838857fd91c82128e81..b0194955e043102c63d82e766074a6e73f06ce5c 100644
--- a/chrome/browser/autofill/autofill_download.h
+++ b/chrome/browser/autofill/autofill_download.h
@@ -6,21 +6,26 @@
 #define CHROME_BROWSER_AUTOFILL_AUTOFILL_DOWNLOAD_H_
 #pragma once
 
+#include <stddef.h>
 #include <list>
 #include <map>
 #include <string>
+#include <utility>
 #include <vector>
 
 #include "base/memory/scoped_vector.h"
 #include "base/time.h"
-#include "chrome/browser/autofill/autofill_profile.h"
-#include "chrome/browser/autofill/field_types.h"
-#include "chrome/browser/autofill/form_structure.h"
 #include "chrome/common/net/url_fetcher.h"
 
 class AutofillMetrics;
+class FormStructure;
+class GURL;
 class Profile;
 
+namespace net {
+class URLRequestStatus;
+}
+
 // Handles getting and updating Autofill heuristics.
 class AutofillDownloadManager : public URLFetcher::Delegate {
  public: