Expose PasswordManagerDriver as a public interface to core Password code.

chrome/browser/password_manager/password_manager.h

Index: chrome/browser/password_manager/password_manager.h
diff --git a/chrome/browser/password_manager/password_manager.h b/chrome/browser/password_manager/password_manager.h
index 3c199c52bca7524a8f6745a69441afe9cdabd73f..a63a66e608d9efe2ad32d31e22ce2b306e62d9ff 100644
--- a/chrome/browser/password_manager/password_manager.h
+++ b/chrome/browser/password_manager/password_manager.h
@@ -21,6 +21,7 @@
 #include "content/public/browser/web_contents_user_data.h"
 
 class PasswordManagerDelegate;
+class PasswordManagerDriver;
 class PasswordManagerTest;
 class PasswordFormManager;
 class PrefRegistrySimple;
@@ -162,10 +163,12 @@ class PasswordManager : public LoginModel,
   // time a user submits a login form and gets to the next page.
   scoped_ptr<PasswordFormManager> provisional_save_manager_;
 
-  // Our delegate for carrying out external operations.  This is typically the
-  // containing WebContents.
+  // The embedder-level client. Must outlive this class.
   PasswordManagerDelegate* const delegate_;
 
+  // The platform-level driver. Must outlive this class.
+  PasswordManagerDriver* const driver_;
+
   // Set to false to disable the password manager (will no longer ask if you
   // want to save passwords but will continue to fill passwords).
   BooleanPrefMember password_manager_enabled_;