Change return type of Tab -navigationManager.

ios/chrome/browser/ui/browser_view_controller.mm

 // 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.
 
 #import "ios/chrome/browser/ui/browser_view_controller.h"
 
 #import <AssetsLibrary/AssetsLibrary.h>
 #import <MobileCoreServices/MobileCoreServices.h>
 #import <PassKit/PassKit.h>
 #import <Photos/Photos.h>
@@ skipping 1900 matching lines @@
   FindInPageController* controller = GetFindInPageController(tab);
   if (controller.findInPageModel.enabled) {
     [self showFindBarWithAnimation:NO
                         selectText:YES
                        shouldFocus:[_findBarController isFocused]];
   }
 
   // Hide the toolbar if displaying phone NTP.
   if (!IsIPadIdiom()) {
     CRWSessionEntry* entry =
-        [[tab navigationManager]->GetSessionController() currentEntry];
+        [[tab navigationManagerImpl]->GetSessionController() currentEntry];
     BOOL hideToolbar = NO;
     if (entry) {
       GURL url = [entry navigationItem]->GetURL();
       BOOL isNTP = url.GetOrigin() == GURL(kChromeUINewTabURL);
       hideToolbar = isNTP && !_isOffTheRecord &&
                     ![_toolbarController isOmniboxFirstResponder] &&
                     ![_toolbarController showingOmniboxPopup];
     }
     [[_toolbarController view] setHidden:hideToolbar];
   }
@@ skipping 1425 matching lines @@
 - (void)showTabHistoryPopupForBackwardHistory {
   DCHECK(self.visible || self.dismissingModal);
 
   // Dismiss the omnibox (if open).
   [_toolbarController cancelOmniboxEdit];
   // Dismiss the soft keyboard (if open).
   Tab* tab = [_model currentTab];
   [tab.webController dismissKeyboard];
 
   DCHECK([tab navigationManager]);
-  CRWSessionController* sc = [tab navigationManager]->GetSessionController();
+  CRWSessionController* sc =
+      [tab navigationManagerImpl]->GetSessionController();
   [_toolbarController showTabHistoryPopupInView:[self view]
                              withSessionEntries:[sc backwardEntries]
                                  forBackHistory:YES];
 }
 
 - (void)showTabHistoryPopupForForwardHistory {
   DCHECK(self.visible || self.dismissingModal);
 
   // Dismiss the omnibox (if open).
   [_toolbarController cancelOmniboxEdit];
   // Dismiss the soft keyboard (if open).
   Tab* tab = [_model currentTab];
   [tab.webController dismissKeyboard];
 
   DCHECK([tab navigationManager]);
-  CRWSessionController* sc = [tab navigationManager]->GetSessionController();
+  CRWSessionController* sc =
+      [tab navigationManagerImpl]->GetSessionController();
   [_toolbarController showTabHistoryPopupInView:[self view]
                              withSessionEntries:[sc forwardEntries]
                                  forBackHistory:NO];
 }
 
 - (void)navigateToSelectedEntry:(id)sender {
   DCHECK([sender isKindOfClass:[TabHistoryCell class]]);
   TabHistoryCell* selectedCell = (TabHistoryCell*)sender;
   [[_model currentTab] goToItem:selectedCell.entry.navigationItem];
   [_toolbarController dismissTabHistoryPopup];
@@ skipping 176 matching lines @@
 
   if (url == [_preloadController prerenderedURL]) {
     Tab* oldTab = [_model currentTab];
     Tab* newTab = [_preloadController releasePrerenderContents];
     DCHECK(oldTab);
     DCHECK(newTab);
     if (oldTab && newTab) {
       [oldTab recordStateInHistory];
       DCHECK([newTab navigationManager]);
       CRWSessionController* newHistory =
-          [newTab navigationManager]->GetSessionController();
+          [newTab navigationManagerImpl]->GetSessionController();
       DCHECK([oldTab navigationManager]);
       CRWSessionController* oldHistory =
-          [oldTab navigationManager]->GetSessionController();
+          [oldTab navigationManagerImpl]->GetSessionController();
       [newHistory insertStateFromSessionController:oldHistory];
       [[newTab nativeAppNavigationController]
           copyStateFrom:[oldTab nativeAppNavigationController]];
       [_model replaceTab:oldTab withTab:newTab];
 
       // Set isPrerenderTab to NO after replacing the tab. This will allow the
       // BrowserViewController to detect that a pre-rendered tab is switched in,
       // and show the prerendering animation.
       newTab.isPrerenderTab = NO;
 
@@ skipping 1205 matching lines @@
 #pragma mark - PreloadControllerDelegate methods
 
 - (BOOL)shouldUseDesktopUserAgent {
   return [_model currentTab].usesDesktopUserAgent;
 }
 
 - (CRWSessionEntry*)currentSessionEntry {
   Tab* tab = [_model currentTab];
   if (![tab navigationManager])
     return nil;
-  return [[tab navigationManager]->GetSessionController() currentEntry];
+  return [[tab navigationManagerImpl]->GetSessionController() currentEntry];
 }
 
 #pragma mark - BookmarkBridgeMethods
 
 // If an added or removed bookmark is the same as the current url, update the
 // toolbar so the star highlight is kept in sync.
 - (void)bookmarkNodeModified:(const BookmarkNode*)node {
   if ([_model currentTab] && node->url() == [_model currentTab].url)
     [self updateToolbar];
 }
@@ skipping 190 matching lines @@
 
 - (UIView*)voiceSearchButton {
   return _voiceSearchButton;
 }
 
 - (id<LogoAnimationControllerOwner>)logoAnimationControllerOwner {
   return [self currentLogoAnimationControllerOwner];
 }
 
 @end