Created web::UserAgentType.

ios/web/public/crw_navigation_item_storage.h

Index: ios/web/public/crw_navigation_item_storage.h
diff --git a/ios/web/public/crw_navigation_item_storage.h b/ios/web/public/crw_navigation_item_storage.h
index 9cc7927f891ef689d21cefdeef932ca7e8921a37..50290e441120af160bab0b84000e7497c664341f 100644
--- a/ios/web/public/crw_navigation_item_storage.h
+++ b/ios/web/public/crw_navigation_item_storage.h
@@ -11,6 +11,7 @@
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "ios/web/public/referrer.h"
+#include "ios/web/public/user_agent.h"
 #import "ios/web/public/web_state/page_display_state.h"
 #include "url/gurl.h"
 
@@ -41,8 +42,11 @@ extern NSString* const kNavigationItemStorageHTTPRequestHeadersKey;
 // Whether or not to bypass showing the resubmit data confirmation when loading
 // a POST request (BOOL).
 extern NSString* const kNavigationItemStorageSkipRepostFormConfirmationKey;
-// Should desktop user agent be used (BOOL)?
-extern NSString* const kNavigationItemStorageUseDesktopUserAgentKey;
+// The user agent type (std::string).
+extern NSString* const kNavigationItemStorageUserAgentTypeKey;
+// Should desktop user agent be used (BOOL).  Deprecated, used for backward
+// compatibility
+extern NSString* const kNavigationItemStorageUseDesktopUserAgentDeprecatedKey;
 
 }  // namespace web
 
@@ -56,8 +60,7 @@ extern NSString* const kNavigationItemStorageUseDesktopUserAgentKey;
 @property(nonatomic, assign) base::string16 title;
 @property(nonatomic, assign) web::PageDisplayState displayState;
 @property(nonatomic, assign) BOOL shouldSkipRepostFormConfirmation;
-@property(nonatomic, assign, getter=isOverridingUserAgent)
-    BOOL overridingUserAgent;
+@property(nonatomic, assign) web::UserAgentType userAgentType;
 @property(nonatomic, copy) NSData* POSTData;
 @property(nonatomic, copy) NSDictionary* HTTPRequestHeaders;