MD Settings: avoid double pref observation on Startup Pages

chrome/browser/ui/webui/settings/chromeos/easy_unlock_settings_handler.h

Index: chrome/browser/ui/webui/settings/chromeos/easy_unlock_settings_handler.h
diff --git a/chrome/browser/ui/webui/settings/chromeos/easy_unlock_settings_handler.h b/chrome/browser/ui/webui/settings/chromeos/easy_unlock_settings_handler.h
index 47fe19749710122b36fcd5e2a1cc6782c060c62d..2a9689402a5a45f8006e19d624ba6c9fc8f1f03c 100644
--- a/chrome/browser/ui/webui/settings/chromeos/easy_unlock_settings_handler.h
+++ b/chrome/browser/ui/webui/settings/chromeos/easy_unlock_settings_handler.h
@@ -7,7 +7,7 @@
 
 #include "base/macros.h"
 #include "chrome/browser/signin/easy_unlock_service_observer.h"
-#include "content/public/browser/web_ui_message_handler.h"
+#include "chrome/browser/ui/webui/settings/md_settings_ui.h"
 
 namespace content {
 class WebUIDataSource;
@@ -18,7 +18,7 @@ class Profile;
 namespace chromeos {
 namespace settings {
 
-class EasyUnlockSettingsHandler : public content::WebUIMessageHandler,
+class EasyUnlockSettingsHandler : public ::settings::SettingsPageUIHandler,
                                   public EasyUnlockServiceObserver {
  public:
   // Returns nullptr if EasyUnlock is not allowed for this device.
@@ -28,7 +28,7 @@ class EasyUnlockSettingsHandler : public content::WebUIMessageHandler,
 
   ~EasyUnlockSettingsHandler() override;
 
-  // WebUIMessageHandler
+  // SettingsPageUIHandler

[dschuyler, 2016/03/10 21:49:49]

missing period.
Maybe add period on line 34 as well.

[Dan Beam, 2016/03/11 00:07:11]

the style guide encourages (but doesn't require) full sentences.  periods are
used to end full sentences.

this is neither a full sentence, nor requires a period, BUT the most common
thing in chrome here is to do:
1) // namespace::Interface:
2) // namespace::Interface implementation.

this code did neither, and my preference is for 1), so I'll make this do 1) for
you (which means i'm actually adding a colon).

   void RegisterMessages() override;
 
   // EasyUnlockServiceObserver