Add FilePath to base namespace.

chrome/browser/chromeos/login/user_image_manager.h

Index: chrome/browser/chromeos/login/user_image_manager.h
diff --git a/chrome/browser/chromeos/login/user_image_manager.h b/chrome/browser/chromeos/login/user_image_manager.h
index f6e4ea4a7f6237968bc69e104d668b6746eaf676..00bb9a77ed427cc3d66808d07807c441b7d55c5a 100644
--- a/chrome/browser/chromeos/login/user_image_manager.h
+++ b/chrome/browser/chromeos/login/user_image_manager.h
@@ -9,9 +9,12 @@
 
 #include "chrome/browser/chromeos/login/user.h"
 
-class FilePath;
 class PrefServiceSimple;
 
+namespace base {
+class FilePath;
+}
+
 namespace gfx {
 class ImageSkia;
 }
@@ -49,7 +52,7 @@ class UserImageManager {
   // Tries to load user image from disk; if successful, sets it for the user,
   // sends LOGIN_USER_IMAGE_CHANGED notification and updates Local State.
   virtual void SaveUserImageFromFile(const std::string& username,
-                                     const FilePath& path) = 0;
+                                     const base::FilePath& path) = 0;
 
   // Sets profile image as user image for |username|, sends
   // LOGIN_USER_IMAGE_CHANGED notification and updates Local State. If the user