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