Cleanup: Remove unneeded forward declarations from chrome/browser/ui/webui.

chrome/browser/ui/webui/fileicon_source_chromeos.h

Index: chrome/browser/ui/webui/fileicon_source_chromeos.h
===================================================================
--- chrome/browser/ui/webui/fileicon_source_chromeos.h	(revision 109585)
+++ chrome/browser/ui/webui/fileicon_source_chromeos.h	(working copy)
@@ -7,16 +7,10 @@
 #pragma once
 
 #include <string>
+
 #include "base/compiler_specific.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
 
-namespace net {
-class URLRequest;
-class URLRequestJob;
-}  // namespace net
-
-class GURL;
-
 // A DataSource for chrome://fileicon/ URLs, but reads from
 // resources instead of disk. Allows for parameterization
 // via chrome://fileicon/path.ext?size=[small|medium|large]
@@ -37,4 +31,3 @@
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_FILEICON_SOURCE_CHROMEOS_H_
-