Add FilePath to base namespace.

chrome/browser/extensions/convert_user_script.h

Index: chrome/browser/extensions/convert_user_script.h
diff --git a/chrome/browser/extensions/convert_user_script.h b/chrome/browser/extensions/convert_user_script.h
index fa02f9048fed39c39a19cb39b3876b66335d839d..b5937773479b11c7c155a372b2266dbdfffc72dc 100644
--- a/chrome/browser/extensions/convert_user_script.h
+++ b/chrome/browser/extensions/convert_user_script.h
@@ -10,9 +10,12 @@
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
 
-class FilePath;
 class GURL;
 
+namespace base {
+class FilePath;
+}
+
 namespace extensions {
 class Extension;
 
@@ -24,8 +27,8 @@ class Extension;
 // NOTE: The caller takes ownership of the directory at extension->path() on the
 // returned object.
 scoped_refptr<extensions::Extension> ConvertUserScriptToExtension(
-    const FilePath& user_script, const GURL& original_url,
-    const FilePath& extensions_dir, string16* error);
+    const base::FilePath& user_script, const GURL& original_url,
+    const base::FilePath& extensions_dir, string16* error);
 
 }  // namespace extensions