Improves first run dialog performance on Win8

chrome/browser/ui/startup/default_browser_prompt_win.cc

Index: chrome/browser/ui/startup/default_browser_prompt_win.cc
diff --git a/chrome/browser/ui/startup/default_browser_prompt_win.cc b/chrome/browser/ui/startup/default_browser_prompt_win.cc
index 04c9cd3d42368543ae8b1f718e6bbeb7189593ff..04b4db9db4bafc11233698c64ba33463305f0fb2 100644
--- a/chrome/browser/ui/startup/default_browser_prompt_win.cc
+++ b/chrome/browser/ui/startup/default_browser_prompt_win.cc
@@ -6,18 +6,13 @@
 
 #include "base/macros.h"
 #include "base/win/windows_version.h"
+#include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/webui/set_as_default_browser_ui.h"
-#include "components/prefs/pref_service.h"
 #include "components/startup_metric_utils/browser/startup_metric_utils.h"
-#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
-#include "content/public/browser/notification_types.h"
-
-using content::BrowserThread;
 
 namespace {
 
@@ -35,7 +30,7 @@ class SetMetroBrowserFlowLauncher : public content::NotificationObserver {
  private:
   explicit SetMetroBrowserFlowLauncher(Profile* profile)
       : profile_(profile) {
-    registrar_.Add(this, content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
+    registrar_.Add(this, chrome::NOTIFICATION_BROWSER_WINDOW_READY,

[sky, 2016/07/06 19:21:18]

Use a BrowserListObserver instead of notification as notifications are
deprecated.

[zmin, 2016/07/06 20:04:30]

Ok, I thought only the notification type with "deprecated" in comments are
deprecated but didn't aware of that all notifications are deprecated.

                    content::NotificationService::AllSources());
   }
 
@@ -54,10 +49,9 @@ void SetMetroBrowserFlowLauncher::Observe(
     int type,
     const content::NotificationSource& source,
     const content::NotificationDetails& details) {
-  DCHECK_EQ(content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME, type);
+  DCHECK_EQ(chrome::NOTIFICATION_BROWSER_WINDOW_READY, type);
 
-  Browser* browser = chrome::FindBrowserWithWebContents(
-      content::Source<content::WebContents>(source).ptr());
+  Browser* browser = content::Source<Browser>(source).ptr();
   if (!browser || !browser->is_type_tabbed())
     return;