Created web::UserAgentType.

ios/web/public/navigation_item.h

Index: ios/web/public/navigation_item.h
diff --git a/ios/web/public/navigation_item.h b/ios/web/public/navigation_item.h
index 21024dcdb8bfd46b8ed0fb60d775dbdc9528e249..6b22ec6bd345421152268bc9f5cffea91a3f7e89 100644
--- a/ios/web/public/navigation_item.h
+++ b/ios/web/public/navigation_item.h
@@ -10,6 +10,7 @@
 #include "base/strings/string16.h"
 #include "base/supports_user_data.h"
 #include "base/time/time.h"
+#import "ios/web/public/user_agent.h"
 #import "ios/web/public/web_state/page_display_state.h"
 #include "ui/base/page_transition_types.h"
 
@@ -108,10 +109,9 @@ class NavigationItem : public base::SupportsUserData {
   virtual void SetTimestamp(base::Time timestamp) = 0;
   virtual base::Time GetTimestamp() const = 0;
 
-  // |true| if this item uses a desktop user agent in HTTP requests and
-  // UIWebView.
-  virtual void SetIsOverridingUserAgent(bool is_overriding_user_agent) = 0;
-  virtual bool IsOverridingUserAgent() const = 0;
+  // The type of user agent requested for the navigation.
+  virtual void SetUserAgentType(UserAgentType type) = 0;
+  virtual UserAgentType GetUserAgentType() const = 0;
 
   // |true| if this item is the result of a POST request with data.
   virtual bool HasPostData() const = 0;