[ios] Added NavigationManager::LoadURLWithParams public API.

ios/web/navigation/navigation_manager_delegate.h

Index: ios/web/navigation/navigation_manager_delegate.h
diff --git a/ios/web/navigation/navigation_manager_delegate.h b/ios/web/navigation/navigation_manager_delegate.h
index aa8b1c0fbd60fcd856f5524898db48d208982fc8..08ba788a36bbbe9ce7f229f667bf761988d0bc5d 100644
--- a/ios/web/navigation/navigation_manager_delegate.h
+++ b/ios/web/navigation/navigation_manager_delegate.h
@@ -7,6 +7,8 @@
 
 #include <stddef.h>
 
+#import "ios/web/public/navigation_manager.h"
+
 namespace web {
 
 struct LoadCommittedDetails;
@@ -23,6 +25,9 @@ class NavigationManagerDelegate {
   // NavigationManagerImpl.
   virtual void NavigateToPendingEntry() = 0;
 
+  // Instructs the delegate to load the URL.
+  virtual void LoadURLWithParams(const NavigationManager::WebLoadParams&) = 0;
+
   // Informs the delegate that committed navigation items have been pruned.
   virtual void OnNavigationItemsPruned(size_t pruned_item_count) = 0;