Remove the concept of currentItemIndex

ios/web/navigation/crw_session_controller.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef IOS_WEB_NAVIGATION_CRW_SESSION_CONTROLLER_H_
 #define IOS_WEB_NAVIGATION_CRW_SESSION_CONTROLLER_H_
 
 #import <Foundation/Foundation.h>
 #include <vector>
 
@@ skipping 12 matching lines @@
 }
 
 // A CRWSessionController is similar to a NavigationController object in desktop
 // Chrome. It maintains information needed to save/restore a tab with its
 // complete session history. There is one of these for each tab.
 // DEPRECATED, do not use this class and do not add any methods to it.
 // Use web::NavigationManager instead.
 // TODO(crbug.com/454984): Remove this class.
 @interface CRWSessionController : NSObject
 
-@property(nonatomic, readonly, assign) NSInteger currentNavigationIndex;
-@property(nonatomic, readonly, assign) NSInteger previousNavigationIndex;
+@property(nonatomic, readonly, assign) NSInteger lastCommittedItemIndex;
+@property(nonatomic, readonly, assign) NSInteger previousItemIndex;
 // The index of the pending item if it is in |items|, or -1 if |pendingItem|
 // corresponds with a new navigation (created by addPendingItem:).
 @property(nonatomic, readwrite, assign) NSInteger pendingItemIndex;
 @property(nonatomic, readonly, strong)
     CRWSessionCertificatePolicyManager* sessionCertificatePolicyManager;
 
 // Whether the CRWSessionController can prune all but the last committed item.
 // This is true when all the following conditions are met:
 // - There is a last committed NavigationItem
 // - There is not currently a pending history navigation
@@ skipping 14 matching lines @@
 @property(nonatomic, readonly) web::NavigationItemImpl* pendingItem;
 // Returns the transient NavigationItem, if any.  The transient item will be
 // discarded on any navigation, and is used to represent interstitials in the
 // session history.
 @property(nonatomic, readonly) web::NavigationItemImpl* transientItem;
 // Returns the NavigationItem corresponding with the last committed load.
 @property(nonatomic, readonly) web::NavigationItemImpl* lastCommittedItem;
 // Returns the NavigationItem corresponding with the previously loaded page.
 @property(nonatomic, readonly) web::NavigationItemImpl* previousItem;
 // Returns a list of all non-redirected NavigationItems whose index precedes
-// |currentNavigationIndex|.
+// |lastCommittedItemIndex|.
 @property(nonatomic, readonly) web::NavigationItemList backwardItems;
 // Returns a list of all non-redirected NavigationItems whose index follow
-// |currentNavigationIndex|.
+// |lastCommittedItemIndex|.
 @property(nonatomic, readonly) web::NavigationItemList forwardItems;
 
 // CRWSessionController doesn't have public constructors. New
 // CRWSessionControllers are created by deserialization, or via a
 // NavigationManager.
 
 // Sets the corresponding NavigationManager.
 - (void)setNavigationManager:(web::NavigationManagerImpl*)navigationManager;
 // Sets the corresponding BrowserState.
 - (void)setBrowserState:(web::BrowserState*)browserState;
@@ skipping 43 matching lines @@
 // For example:
 // source: A B *C* D
 // this:   E F *G*
 // result: A B C *G*
 //
 // If there is a pending item after *G* in |this|, it is also preserved.
 // This ignores any pending or transient entries in |source|.  No-op if
 // |canPruneAllButLastCommittedItem| is false.
 - (void)copyStateFromSessionControllerAndPrune:(CRWSessionController*)source;
 
-// Sets |currentNavigationIndex_| to the |index| if it's in the entries bounds.
+// Sets |lastCommittedItemIndex| to the |index| if it's in the entries bounds.
 - (void)goToItemAtIndex:(NSInteger)index;
 
 // Removes the item at |index| after discarding any noncomitted entries.
 // |index| must not be the index of the last committed item, or a noncomitted
 // item.
 - (void)removeItemAtIndex:(NSInteger)index;
 
 // Determines whether a navigation between |firstEntry| and |secondEntry| is a
 // same-document navigation.  Entries can be passed in any order.
 - (BOOL)isSameDocumentNavigationBetweenItem:(web::NavigationItem*)firstItem
                                     andItem:(web::NavigationItem*)secondItem;
 
 // Returns the index of |item| in |items|.
 - (NSInteger)indexOfItem:(const web::NavigationItem*)item;
 
 // Returns the item at |index| in |items|.
 - (web::NavigationItemImpl*)itemAtIndex:(NSInteger)index;
 
 @end
 
 #endif  // IOS_WEB_NAVIGATION_CRW_SESSION_CONTROLLER_H_