build: Enable auto raw pointer deduction check everywhere on clang.

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 1381 matching lines @@
   return NO;
 }
 
 - (void)webWillFinishHistoryNavigationFromEntry:(CRWSessionEntry*)fromEntry {
   [parentTabModel_ notifyTabChanged:self];
 }
 
 - (void)webState:(web::WebState*)webState
     didFinishNavigation:(web::NavigationContext*)navigation {
   if (navigation->IsSamePage()) {
-    auto faviconDriver = favicon::WebFaviconDriver::FromWebState(webState);
+    auto* faviconDriver = favicon::WebFaviconDriver::FromWebState(webState);
     if (faviconDriver) {
       // Fetch the favicon for the new URL.
       faviconDriver->FetchFavicon(navigation->GetUrl());
     }
   }
   [parentTabModel_ notifyTabChanged:self];
 }
 
 // Records the state (scroll position, form values, whatever can be
 // harvested) from the current page into the current session entry.
@@ skipping 819 matching lines @@
 
 - (TabModel*)parentTabModel {
   return parentTabModel_;
 }
 
 - (FormInputAccessoryViewController*)inputAccessoryViewController {
   return inputAccessoryViewController_.get();
 }
 
 @end