Handle the PasswordManagerAllowShowPasswords preference in the options webui.

chrome/browser/ui/webui/options/password_manager_handler.h

Index: chrome/browser/ui/webui/options/password_manager_handler.h
diff --git a/chrome/browser/ui/webui/options/password_manager_handler.h b/chrome/browser/ui/webui/options/password_manager_handler.h
index b316a757544655633ee584d8683da92ee3a19b5d..4903765cba535f96dbaf60b67dacb5ceb377681c 100644
--- a/chrome/browser/ui/webui/options/password_manager_handler.h
+++ b/chrome/browser/ui/webui/options/password_manager_handler.h
@@ -11,6 +11,7 @@
 #include "base/memory/scoped_vector.h"
 #include "chrome/browser/password_manager/password_store.h"
 #include "chrome/browser/password_manager/password_store_consumer.h"
+#include "chrome/browser/prefs/pref_member.h"
 #include "chrome/browser/ui/webui/options/options_ui.h"
 
 class PasswordManagerHandler : public OptionsPageUIHandler,
@@ -27,6 +28,11 @@ class PasswordManagerHandler : public OptionsPageUIHandler,
   // PasswordStore::Observer implementation.
   virtual void OnLoginsChanged();
 
+  // NotificationObserver implementation.
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
  private:
   // The password store associated with the currently active profile.
   PasswordStore* GetPasswordStore();
@@ -114,6 +120,9 @@ class PasswordManagerHandler : public OptionsPageUIHandler,
   // User's pref
   std::string languages_;
 
+  // Whether to show stored passwords or not.
+  BooleanPrefMember show_passwords_;
+
   DISALLOW_COPY_AND_ASSIGN(PasswordManagerHandler);
 };