Updated CRWSessionController interface to use NavigationItems.

ios/web/navigation/navigation_manager_impl.mm

Index: ios/web/navigation/navigation_manager_impl.mm
diff --git a/ios/web/navigation/navigation_manager_impl.mm b/ios/web/navigation/navigation_manager_impl.mm
index 372d8a0db5510cd30469c76609ab085bdf5be775..0f5b9dcde986b4b5fd71f19123af50fb06aa786f 100644
--- a/ios/web/navigation/navigation_manager_impl.mm
+++ b/ios/web/navigation/navigation_manager_impl.mm
@@ -223,7 +223,7 @@ bool AreURLsInPageNavigation(const GURL& existing_url, const GURL& new_url) {
 }
 
 void NavigationManagerImpl::DiscardNonCommittedItems() {
-  [session_controller_ discardNonCommittedEntries];
+  [session_controller_ discardNonCommittedItems];
 }
 
 void NavigationManagerImpl::LoadIfNecessary() {
@@ -259,9 +259,9 @@ bool AreURLsInPageNavigation(const GURL& existing_url, const GURL& new_url) {
 }
 
 int NavigationManagerImpl::GetPendingItemIndex() const {
-  if ([session_controller_ hasPendingEntry]) {
-    if ([session_controller_ pendingEntryIndex] != -1) {
-      return [session_controller_ pendingEntryIndex];
+  if ([session_controller_ pendingEntry]) {
+    if ([session_controller_ pendingItemIndex] != -1) {
+      return [session_controller_ pendingItemIndex];
     }
     // TODO(crbug.com/665189): understand why current item index is
     // returned here.
@@ -285,7 +285,7 @@ bool AreURLsInPageNavigation(const GURL& existing_url, const GURL& new_url) {
   if (idx >= entries.count)
     return false;
 
-  [session_controller_ removeEntryAtIndex:index];
+  [session_controller_ removeItemAtIndex:index];
   return true;
 }
 
@@ -342,12 +342,12 @@ bool AreURLsInPageNavigation(const GURL& existing_url, const GURL& new_url) {
 }
 
 int NavigationManagerImpl::GetIndexForOffset(int offset) const {
-  int result = [session_controller_ pendingEntryIndex] == -1
+  int result = [session_controller_ pendingItemIndex] == -1
                    ? GetCurrentItemIndex()
-                   : static_cast<int>([session_controller_ pendingEntryIndex]);
+                   : static_cast<int>([session_controller_ pendingItemIndex]);
 
   if (offset < 0) {
-    if (GetTransientItem() && [session_controller_ pendingEntryIndex] == -1) {
+    if (GetTransientItem() && [session_controller_ pendingItemIndex] == -1) {
       // Going back from transient item that added to the end navigation stack
       // is a matter of discarding it as there is no need to move navigation
       // index back.
@@ -371,7 +371,7 @@ bool AreURLsInPageNavigation(const GURL& existing_url, const GURL& new_url) {
     if (result > GetItemCount() /* overflow */)
       result = INT_MIN;
   } else if (offset > 0) {
-    if (GetPendingItem() && [session_controller_ pendingEntryIndex] == -1) {
+    if (GetPendingItem() && [session_controller_ pendingItemIndex] == -1) {
       // Chrome for iOS does not allow forward navigation if there is another
       // pending navigation in progress. Returning invalid index indicates that
       // forward navigation will not be allowed (and |INT_MAX| works for that).