Fix glue for ClipboardHostMsg_ReadAvailableTypes.

ui/base/clipboard/clipboard_mac.mm

Index: ui/base/clipboard/clipboard_mac.mm
diff --git a/ui/base/clipboard/clipboard_mac.mm b/ui/base/clipboard/clipboard_mac.mm
index 77f595235da3533b4053602ea15fd7243c17d9d6..be1908bb100846cb587a21d11368a503ac5f4843 100644
--- a/ui/base/clipboard/clipboard_mac.mm
+++ b/ui/base/clipboard/clipboard_mac.mm
@@ -177,6 +177,19 @@ bool Clipboard::IsFormatAvailable(const Clipboard::FormatType& format,
   return [types containsObject:format_ns];
 }
 
+void Clipboard::ReadAvailableTypes(Clipboard::Buffer buffer,
+                                   std::vector<string16>* types,
+                                   bool* contains_filenames) const {
+  if (!types || !contains_filenames) {
+    NOTREACHED();
+    return;
+  }
+
+  // TODO(dcheng): Implement me.
+  types->clear();
+  *contains_filenames = false;
+}
+
 void Clipboard::ReadText(Clipboard::Buffer buffer, string16* result) const {
   DCHECK_EQ(buffer, BUFFER_STANDARD);
   NSPasteboard* pb = GetPasteboard();