Implement ui::ClipboardMus.

ui/base/test/test_clipboard.cc

Index: ui/base/test/test_clipboard.cc
diff --git a/ui/base/test/test_clipboard.cc b/ui/base/test/test_clipboard.cc
index 2971149683e0267f60e2c336c6c951ae1208bea8..0eb8cb98a0c1bc7f7511061c4b9fa285f7f924bd 100644
--- a/ui/base/test/test_clipboard.cc
+++ b/ui/base/test/test_clipboard.cc
@@ -5,6 +5,7 @@
 #include "ui/base/test/test_clipboard.h"
 
 #include <stddef.h>
+#include "base/memory/ptr_util.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 
@@ -21,7 +22,7 @@ Clipboard* TestClipboard::CreateForCurrentThread() {
   base::AutoLock lock(Clipboard::clipboard_map_lock_.Get());
   Clipboard* clipboard = new TestClipboard;
   Clipboard::clipboard_map_.Get()[base::PlatformThread::CurrentId()] =
-      clipboard;
+      base::WrapUnique(clipboard);
   return clipboard;
 }