Re-sync ios/web with downstream version

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 e067a82ee32b2feae65a2f0e469e4f6af5efb8c2..37d4e06b4f20241133607ccd79983965380b440c 100644
--- a/ios/web/public/navigation_item.h
+++ b/ios/web/public/navigation_item.h
@@ -13,6 +13,12 @@
 
 class GURL;
 
+#if defined(__OBJC__)
+@class NSDictionary;
+#else
+class NSDictionary;
+#endif  // __OBJC__
+
 namespace web {
 struct FaviconStatus;
 struct Referrer;
@@ -114,6 +120,21 @@ class NavigationItem {
   // property doesn't get serialized.
   virtual void SetUnsafe(bool is_unsafe) = 0;
   virtual bool IsUnsafe() 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;
+
+  // |true| if this item is the result of a POST request with data.
+  virtual bool HasPostData() const = 0;
+
+  // Returns the item's current http request headers.
+  virtual NSDictionary* GetHttpRequestHeaders() const = 0;
+
+  // Adds headers from |additional_headers| to the item's http request headers.
+  // Existing headers with the same key will be overridden.
+  virtual void AddHttpRequestHeaders(NSDictionary* additional_headers) = 0;
 };
 
 }  // namespace web