Add FilePath to base namespace.

chrome/browser/ui/user_data_dir_dialog.h

Index: chrome/browser/ui/user_data_dir_dialog.h
diff --git a/chrome/browser/ui/user_data_dir_dialog.h b/chrome/browser/ui/user_data_dir_dialog.h
index 7b25933a08e9eb0bf91aad13a14c3610e52379fd..eb8418ed79247fdba7946267eafb5fed58fae357 100644
--- a/chrome/browser/ui/user_data_dir_dialog.h
+++ b/chrome/browser/ui/user_data_dir_dialog.h
@@ -5,7 +5,9 @@
 #ifndef CHROME_BROWSER_UI_USER_DATA_DIR_DIALOG_H_
 #define CHROME_BROWSER_UI_USER_DATA_DIR_DIALOG_H_
 
+namespace base {
 class FilePath;
+}
 
 namespace chrome {
 
@@ -13,7 +15,7 @@ namespace chrome {
 // is showing. If the user picks a directory, this method returns the chosen
 // directory. |user_data_dir| is the value of the directory we were not able to
 // use.
-FilePath ShowUserDataDirDialog(const FilePath& user_data_dir);
+base::FilePath ShowUserDataDirDialog(const base::FilePath& user_data_dir);
 
 }  // namespace chrome