Add FilePath to base namespace.

chrome/browser/chromeos/enterprise_extension_observer.h

Index: chrome/browser/chromeos/enterprise_extension_observer.h
diff --git a/chrome/browser/chromeos/enterprise_extension_observer.h b/chrome/browser/chromeos/enterprise_extension_observer.h
index 8ffd97cc8d95028a34a1d91e0e706adc10dc2ae1..1f51da3c95bdae4fc907e6734904f3aca802bd2d 100644
--- a/chrome/browser/chromeos/enterprise_extension_observer.h
+++ b/chrome/browser/chromeos/enterprise_extension_observer.h
@@ -13,9 +13,12 @@
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 
-class FilePath;
 class Profile;
 
+namespace base {
+class FilePath;
+}
+
 namespace chromeos {
 
 // This observer listens for installed extensions and restarts the ChromeOS
@@ -31,7 +34,7 @@ class EnterpriseExtensionObserver
                        const content::NotificationDetails& details) OVERRIDE;
 
  private:
-  static void CheckExtensionAndNotifyEntd(const FilePath& path);
+  static void CheckExtensionAndNotifyEntd(const base::FilePath& path);
   static void NotifyEntd();
 
   Profile* profile_;