FBTF: Forward declare and move constructors in chrome/common/extensions/.

chrome/common/extensions/extension_file_util.h

Index: chrome/common/extensions/extension_file_util.h
diff --git a/chrome/common/extensions/extension_file_util.h b/chrome/common/extensions/extension_file_util.h
index a938a247de139bfc2f9a11b42b983a95a12477f0..548eb3c73c9853ed2cc0c7607f72555825537dc2 100644
--- a/chrome/common/extensions/extension_file_util.h
+++ b/chrome/common/extensions/extension_file_util.h
@@ -7,11 +7,12 @@
 #pragma once
 
 #include <string>
+#include <map>
 
-#include "chrome/common/extensions/extension.h"
-
+class Extension;
 class ExtensionMessageBundle;
 class FilePath;
+class GURL;
 
 // Utilties for manipulating the on-disk storage of extensions.
 namespace extension_file_util {