Fix user agent override restore pipeline

chrome/browser/sessions/session_service.cc

Index: chrome/browser/sessions/session_service.cc
diff --git a/chrome/browser/sessions/session_service.cc b/chrome/browser/sessions/session_service.cc
index a9c5364613508a435383424b14f29324f40cb849..28e7ce1b9f0d2f5555176c8b05d4c4f9872ccbbc 100644
--- a/chrome/browser/sessions/session_service.cc
+++ b/chrome/browser/sessions/session_service.cc
@@ -519,6 +519,9 @@ void SessionService::Init() {
                  content::NotificationService::AllSources());
   registrar_.Add(this, content::NOTIFICATION_NAV_ENTRY_COMMITTED,
                  content::NotificationService::AllSources());
+  registrar_.Add(
+      this, content::NOTIFICATION_WEB_CONTENTS_USER_AGENT_OVERRIDE_CHANGED,
+      content::NotificationService::AllSources());
   // Wait for NOTIFICATION_BROWSER_WINDOW_READY so that is_app() is set.
   registrar_.Add(this, chrome::NOTIFICATION_BROWSER_WINDOW_READY,
                  content::NotificationService::AllBrowserContextsAndSources());
@@ -700,6 +703,17 @@ void SessionService::Observe(int type,
       break;
     }
 
+    case content::NOTIFICATION_WEB_CONTENTS_USER_AGENT_OVERRIDE_CHANGED: {
+      TabContents* tab = TabContents::FromWebContents(
+          content::Source<content::WebContents>(source).ptr());
+      if (!tab || tab->profile() != profile())
+        return;
+      SetTabUserAgentOverride(tab->restore_tab_helper()->window_id(),
+                              tab->restore_tab_helper()->session_id(),
+                              tab->web_contents()->GetUserAgentOverride());
+      break;
+    }
+
     case chrome::NOTIFICATION_TAB_CONTENTS_APPLICATION_EXTENSION_CHANGED: {
       extensions::TabHelper* extension_tab_helper =
           content::Source<extensions::TabHelper>(source).ptr();