webui: Change slightly how the scale-factor gets parsed from a URL.

chrome/browser/ui/webui/fileicon_source.cc

Index: chrome/browser/ui/webui/fileicon_source.cc
diff --git a/chrome/browser/ui/webui/fileicon_source.cc b/chrome/browser/ui/webui/fileicon_source.cc
index bb802765487975fdf3c2ce262a3ee2bcce141c36..0e05f071505dcc6983235502e1ce5f6bcdf3ad33 100644
--- a/chrome/browser/ui/webui/fileicon_source.cc
+++ b/chrome/browser/ui/webui/fileicon_source.cc
@@ -82,7 +82,7 @@ void ParseQueryParams(const std::string& query,
     if (icon_size && iter->first == kIconSize)
       *icon_size = SizeStringToIconSize(iter->second);
     else if (scale_factor && iter->first == kScaleFactor)
-      *scale_factor = web_ui_util::ParseScaleFactor(iter->second);
+      web_ui_util::ParseScaleFactor(iter->second, scale_factor);
   }
 }