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

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 2535 matching lines @@
 
 - (void)webState:(web::WebState*)webState
     runRepostFormDialogWithCompletionHandler:(void (^)(BOOL))handler {
   // Display the action sheet with the arrow pointing at the top center of the
   // web contents.
   Tab* tab = LegacyTabHelper::GetTabForWebState(webState);
   UIView* view = webState->GetView();
   CGPoint dialogLocation =
       CGPointMake(CGRectGetMidX(view.frame),
                   CGRectGetMinY(view.frame) + [self headerHeightForTab:tab]);
-  auto helper = RepostFormTabHelper::FromWebState(webState);
+  auto* helper = RepostFormTabHelper::FromWebState(webState);
   helper->PresentDialog(dialogLocation, base::BindBlock(^(bool shouldContinue) {
                           handler(shouldContinue);
                         }));
 }
 
 - (web::JavaScriptDialogPresenter*)javaScriptDialogPresenterForWebState:
     (web::WebState*)webState {
   return _javaScriptDialogPresenter.get();
 }
 
@@ skipping 2458 matching lines @@
 
 - (UIView*)voiceSearchButton {
   return _voiceSearchButton;
 }
 
 - (id<LogoAnimationControllerOwner>)logoAnimationControllerOwner {
   return [self currentLogoAnimationControllerOwner];
 }
 
 @end