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

ios/chrome/browser/sessions/session_service.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/sessions/session_service.h"
 
 #import <UIKit/UIKit.h>
 
 #include "base/files/file_path.h"
 #include "base/location.h"
@@ skipping 66 matching lines @@
   if (!singleton) {
     singleton = [[[self class] alloc] init];
   }
   return singleton;
 }
 
 - (id)init {
   self = [super init];
   if (self) {
     pendingWindows_.reset([[NSMutableDictionary alloc] init]);
-    auto pool = web::WebThread::GetBlockingPool();
+    auto* pool = web::WebThread::GetBlockingPool();
     taskRunner_ = pool->GetSequencedTaskRunner(pool->GetSequenceToken());
   }
   return self;
 }
 
 // Returns the path of the session file.
 - (NSString*)sessionFilePathForDirectory:(NSString*)directory {
   return [directory stringByAppendingPathComponent:@"session.plist"];
 }
 
@@ skipping 148 matching lines @@
         base::ThreadRestrictions::AssertIOAllowed();
         NSFileManager* fileManager = [NSFileManager defaultManager];
         if (![fileManager fileExistsAtPath:sessionFile])
           return;
         if (![fileManager removeItemAtPath:sessionFile error:nil])
           CHECK(false) << "Unable to delete session file.";
       }));
 }
 
 @end