[Mac] Blacklist PDF so that they are downloaded instead of handled by QuickTime

webkit/glue/plugins/plugin_list_mac.mm

Index: webkit/glue/plugins/plugin_list_mac.mm
diff --git a/webkit/glue/plugins/plugin_list_mac.mm b/webkit/glue/plugins/plugin_list_mac.mm
index f37f4413e42c61559384e552eee41e45f0a90784..1a30d5027b0675466f31f2c3a5a134dbff5c9ae0 100644
--- a/webkit/glue/plugins/plugin_list_mac.mm
+++ b/webkit/glue/plugins/plugin_list_mac.mm
@@ -88,6 +88,8 @@ bool PluginList::ShouldLoadPlugin(const WebPluginInfo& info,
     "application/x-vnd.movenetworks.qm",  // Crashes during initialization.
     "application/vnd.o3d.auto",           // Doesn't render, and having it
                                           // detected can prevent fallbacks.
+    "application/x-pdf",                  // Force download of PDFs rather than
+    "application/pdf"                     // showing the 1st page through QT.
   };
   // In the case of plugins that share MIME types, we have to blacklist by name.
   const char* blacklisted_plugin_names[] = {