extensions: Change auto to not deduce raw pointers.

extensions/test/test_extensions_client.cc

 // Copyright 2014 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 "extensions/test/test_extensions_client.h"
 
 #include "base/stl_util.h"
 #include "extensions/common/api/generated_schemas.h"
 #include "extensions/common/common_manifest_handlers.h"
 #include "extensions/common/extension_urls.h"
@@ skipping 161 matching lines @@
 }
 
 bool TestExtensionsClient::IsBlacklistUpdateURL(const GURL& url) const {
   return true;
 }
 
 std::set<base::FilePath> TestExtensionsClient::GetBrowserImagePaths(
     const Extension* extension) {
   std::set<base::FilePath> result =
       ExtensionsClient::GetBrowserImagePaths(extension);
-  for (auto filter : browser_image_filters_)
+  for (auto* filter : browser_image_filters_)
     filter->Filter(extension, &result);
   return result;
 }
 
 }  // namespace extensions