Created web::UserAgentType.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index 3564aabbfe50277e7ea23904b89f5f683b6b3132..bcc78f29d74eaaa34af7b7f863eed073f3b514e3 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -2351,7 +2351,7 @@ - (BOOL)shouldClosePageOnNativeApplicationLoad {
 
 - (BOOL)usesDesktopUserAgent {
   web::NavigationItem* item = [self currentNavItem];
-  return item && item->IsOverridingUserAgent();
+  return item && item->GetUserAgentType() == web::UserAgentType::DESKTOP;
 }
 
 - (web::MojoFacade*)mojoFacade {
@@ -2403,10 +2403,8 @@ - (void)updateDesktopUserAgentForEntry:(CRWSessionEntry*)entry
   web::NavigationItemImpl* fromItem = fromEntry.navigationItemImpl;
   if (!item || !fromItem)
     return;
-  bool useDesktopUserAgent = item->IsOverridingUserAgent();
-  if (useDesktopUserAgent != fromItem->IsOverridingUserAgent()) {
+  if (item->GetUserAgentType() != fromItem->GetUserAgentType())

[Eugene But (OOO till 7-30), 2017/02/25 01:51:52]

If new UA is NONE, then page reconstruction is unnecessary, right?

[kkhorimoto, 2017/02/27 23:29:04]

Done.

     [self requirePageReconstruction];
-  }
 }
 
 #pragma mark -