Pass correct dummy filename ("name.html" instead of "name./html") to GTK MIME...

chrome/browser/ui/gtk/dialogs_gtk.cc

Index: chrome/browser/ui/gtk/dialogs_gtk.cc
===================================================================
--- chrome/browser/ui/gtk/dialogs_gtk.cc	(revision 71648)
+++ chrome/browser/ui/gtk/dialogs_gtk.cc	(working copy)
@@ -266,7 +266,7 @@
         if (!filter)
           filter = gtk_file_filter_new();
         std::string mime_type = mime_util::GetFileMimeType(
-            FilePath("name.").Append(file_types_.extensions[i][j]));
+            FilePath("name").ReplaceExtension(file_types_.extensions[i][j]));
         gtk_file_filter_add_mime_type(filter, mime_type.c_str());
       }
     }
@@ -283,7 +283,7 @@
       // There is no system default filter description so we use
       // the MIME type itself if the description is blank.
       std::string mime_type = mime_util::GetFileMimeType(
-          FilePath("name.").Append(file_types_.extensions[i][0]));
+          FilePath("name").ReplaceExtension(file_types_.extensions[i][0]));
       gtk_file_filter_set_name(filter, mime_type.c_str());
     }