extensions: Change auto to not deduce raw pointers.

extensions/test/test_extensions_client.cc

Index: extensions/test/test_extensions_client.cc
diff --git a/extensions/test/test_extensions_client.cc b/extensions/test/test_extensions_client.cc
index d439162291511e6becf43dd5e93a640852a29426..7ec31ad87989466568a76b1344210bf48e4a1327 100644
--- a/extensions/test/test_extensions_client.cc
+++ b/extensions/test/test_extensions_client.cc
@@ -179,7 +179,7 @@ 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;
 }