Revert of (Set)IsOverridingUserAgent should be called on VisibleItem

ios/web/navigation/crw_session_controller.mm

Index: ios/web/navigation/crw_session_controller.mm
diff --git a/ios/web/navigation/crw_session_controller.mm b/ios/web/navigation/crw_session_controller.mm
index 7f7eec763044f42cc71f4adbadc558bfcb7f17de..d03bf9481386425669ff7c8f9bbaf4f29a8a8796 100644
--- a/ios/web/navigation/crw_session_controller.mm
+++ b/ios/web/navigation/crw_session_controller.mm
@@ -73,6 +73,10 @@
   // The timestamp of the last time this tab is visited, represented in time
   // interval since 1970.
   NSTimeInterval _lastVisitedTimestamp;
+
+  // If |YES|, override |currentEntry.useDesktopUserAgent| and create the
+  // pending entry using the desktop user agent.
+  BOOL _useDesktopUserAgentForNextPendingItem;
 
   // The browser state associated with this CRWSessionController;
   web::BrowserState* _browserState;  // weak
@@ -492,14 +496,11 @@
                 transition:(ui::PageTransition)transition {
   DCHECK(![self pendingEntry]);
   DCHECK([self currentEntry]);
-
-  web::NavigationItem* lastCommittedItem =
-      self.lastCommittedEntry.navigationItem;
+  web::NavigationItem* currentItem = [self currentEntry].navigationItem;
   CHECK(web::history_state_util::IsHistoryStateChangeValid(
-      lastCommittedItem->GetURL(), URL));
-
-  web::Referrer referrer(lastCommittedItem->GetURL(),
-                         web::ReferrerPolicyDefault);
+      currentItem->GetURL(), URL));
+  web::Referrer referrer(currentItem->GetURL(), web::ReferrerPolicyDefault);
+
   base::scoped_nsobject<CRWSessionEntry> pushedEntry([self
       sessionEntryWithURL:URL
                  referrer:referrer
@@ -507,11 +508,11 @@
            initiationType:web::NavigationInitiationType::USER_INITIATED]);
 
   web::NavigationItemImpl* pushedItem = [pushedEntry navigationItemImpl];
-  pushedItem->SetIsOverridingUserAgent(
-      lastCommittedItem->IsOverridingUserAgent());
+  pushedItem->SetIsOverridingUserAgent(currentItem->IsOverridingUserAgent());
   pushedItem->SetSerializedStateObject(stateObject);
   pushedItem->SetIsCreatedFromPushState(true);
-  pushedItem->GetSSL() = lastCommittedItem->GetSSL();
+  web::SSLStatus& sslStatus = [self currentEntry].navigationItem->GetSSL();
+  pushedEntry.get().navigationItem->GetSSL() = sslStatus;
 
   [self clearForwardItems];
   // Add the new entry at the end.