Replace requirePageReconstruction with setCustomUserAgent

ios/web/web_state/web_view_internal_creation_util.h

Index: ios/web/web_state/web_view_internal_creation_util.h
diff --git a/ios/web/web_state/web_view_internal_creation_util.h b/ios/web/web_state/web_view_internal_creation_util.h
index 68e8912b914081ae99a51165a2884022b91ae6f5..38226bf54abd918973c40dc5e4e34f8d0a3a2779 100644
--- a/ios/web/web_state/web_view_internal_creation_util.h
+++ b/ios/web/web_state/web_view_internal_creation_util.h
@@ -8,6 +8,8 @@
 #import <CoreGraphics/CoreGraphics.h>
 #import <WebKit/WebKit.h>
 
+#include "ios/web/public/user_agent.h"
+
 @protocol CRWContextMenuDelegate;
 
 // This file is a collection of functions that vend web views.
@@ -26,7 +28,7 @@ class BrowserState;
 WKWebView* BuildWKWebView(CGRect frame,
                           WKWebViewConfiguration* configuration,
                           BrowserState* browser_state,
-                          BOOL use_desktop_user_agent,
+                          UserAgentType user_agent_type,
                           id<CRWContextMenuDelegate> context_menu_delegate);
 
 // Creates and returns a new WKWebView for displaying regular web content.
@@ -35,7 +37,7 @@ WKWebView* BuildWKWebView(CGRect frame,
 WKWebView* BuildWKWebView(CGRect frame,
                           WKWebViewConfiguration* configuration,
                           BrowserState* browser_state,
-                          BOOL use_desktop_user_agent);
+                          UserAgentType user_agent_type);
 
 // Creates and returns a new WKWebView for displaying regular web content.
 // The preconditions for the creation of a WKWebView are the same as the