Remove auto raw pointer deduction from non-linux specific code.

ios/chrome/browser/tabs/tab.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/tabs/tab.h"
 
 #import <CoreLocation/CoreLocation.h>
 #import <UIKit/UIKit.h>
 
 #include <utility>
@@ skipping 2010 matching lines @@
 - (void)webControllerDidSuppressDialog:(id)webController {
   DCHECK(isPrerenderTab_);
   [delegate_ discardPrerender];
 }
 
 - (CRWWebController*)webController:(CRWWebController*)webController
          createWebControllerForURL:(const GURL&)URL
                          openerURL:(const GURL&)openerURL
                    initiatedByUser:(BOOL)initiatedByUser {
   if (!initiatedByUser) {
-    auto helper = BlockedPopupTabHelper::FromWebState(webController.webState);
+    auto* helper = BlockedPopupTabHelper::FromWebState(webController.webState);
     if (helper->ShouldBlockPopup(openerURL)) {
       [self blockPopupForURL:URL openerURL:openerURL];
       return nil;
     }
   }
 
   [self updateSnapshotWithOverlay:YES visibleFrameOnly:YES];
   Tab* tab = [parentTabModel_
       insertBlankTabWithTransition:ui::PAGE_TRANSITION_LINK
                             opener:self
@@ skipping 205 matching lines @@
 
 - (TabModel*)parentTabModel {
   return parentTabModel_;
 }
 
 - (FormInputAccessoryViewController*)inputAccessoryViewController {
   return inputAccessoryViewController_.get();
 }
 
 @end