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

chrome/browser/chromeos/arc/downloads_watcher/arc_downloads_watcher_service.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/chromeos/arc/downloads_watcher/arc_downloads_watcher_service.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <iterator>
@@ skipping 156 matching lines @@
 }  // namespace
 
 bool HasAndroidSupportedMediaExtension(const base::FilePath& path) {
   const std::string extension = base::ToLowerASCII(path.Extension());
   const auto less_comparator = [](const char* a, const char* b) {
     return strcmp(a, b) < 0;
   };
   DCHECK(std::is_sorted(std::begin(kAndroidSupportedMediaExtensions),
                         std::end(kAndroidSupportedMediaExtensions),
                         less_comparator));
-  auto iter = std::lower_bound(std::begin(kAndroidSupportedMediaExtensions),
-                               std::end(kAndroidSupportedMediaExtensions),
-                               extension.c_str(), less_comparator);
+  auto** iter = std::lower_bound(std::begin(kAndroidSupportedMediaExtensions),
+                                 std::end(kAndroidSupportedMediaExtensions),
+                                 extension.c_str(), less_comparator);
   return iter != std::end(kAndroidSupportedMediaExtensions) &&
          strcmp(*iter, extension.c_str()) == 0;
 }
 
 // The core part of ArcDownloadsWatcherService to watch for file changes in
 // Downloads directory.
 class ArcDownloadsWatcherService::DownloadsWatcher {
  public:
   using Callback = base::Callback<void(const std::vector<std::string>& paths)>;
 
@@ skipping 167 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   auto* instance = ARC_GET_INSTANCE_FOR_METHOD(
       arc_bridge_service()->file_system(), RequestMediaScan);
   if (!instance)
     return;
   instance->RequestMediaScan(paths);
 }
 
 }  // namespace arc