Always set the navigation pending item for page reload.

ios/web/web_state/ui/crw_web_controller.mm

Index: ios/web/web_state/ui/crw_web_controller.mm
diff --git a/ios/web/web_state/ui/crw_web_controller.mm b/ios/web/web_state/ui/crw_web_controller.mm
index b08853eabb5849c1b0d164fb126dd5db04d28b66..22cf74091cb87c39d1f71c1955b0a191eea77c05 100644
--- a/ios/web/web_state/ui/crw_web_controller.mm
+++ b/ios/web/web_state/ui/crw_web_controller.mm
@@ -1520,11 +1520,18 @@ registerLoadRequestForURL:(const GURL&)requestURL
     // Typically on PAGE_TRANSITION_CLIENT_REDIRECT.
     [[self sessionController] updatePendingItem:requestURL];
   } else {
-    // A new session history entry needs to be created.
-    self.navigationManagerImpl->AddPendingItem(
-        requestURL, referrer, transition,
-        web::NavigationInitiationType::RENDERER_INITIATED,
-        web::NavigationManager::UserAgentOverrideOption::INHERIT);
+    // If this is a reload then there no need to create a new pending item,
+    // instead update the pending item to the last committed item.
+    if (PageTransitionCoreTypeIs(transition, ui::PAGE_TRANSITION_RELOAD)) {
+      self.sessionController.pendingItemIndex =
+          self.sessionController.lastCommittedItemIndex;
+    } else {
+      // A new session history entry needs to be created.
+      self.navigationManagerImpl->AddPendingItem(
+          requestURL, referrer, transition,
+          web::NavigationInitiationType::RENDERER_INITIATED,
+          web::NavigationManager::UserAgentOverrideOption::INHERIT);
+    }
   }
   std::unique_ptr<web::NavigationContextImpl> context =
       web::NavigationContextImpl::CreateNavigationContext(
@@ -1979,6 +1986,11 @@ registerLoadRequestForURL:(const GURL&)requestURL
     BOOL isChromeScheme =
         web::GetWebClient()->IsAppSpecificURL(currentNavigationURL);
 
+    // Since this is implicit reload, no new pending item should be created, set
+    // the pending item index to the last committed item.
+    self.sessionController.pendingItemIndex =
+        self.sessionController.lastCommittedItemIndex;
+
     // Don't immediately load the web page if in overlay mode. Always load if
     // native.
     if (isChromeScheme || !_overlayPreviewMode) {
@@ -2020,6 +2032,10 @@ registerLoadRequestForURL:(const GURL&)requestURL
   _lastUserInteraction.reset();
   base::RecordAction(UserMetricsAction("Reload"));
   GURL url = self.currentNavItem->GetURL();
+  // Reloading shouldn't create create a new pending item, instead set the
+  // pending item index to the last committed item.
+  self.sessionController.pendingItemIndex =
+      self.sessionController.lastCommittedItemIndex;
   if ([self shouldLoadURLInNativeView:url]) {
     std::unique_ptr<web::NavigationContextImpl> navigationContext = [self
         registerLoadRequestForURL:url