Fix a leak in a MacViews pasteboard test.

ui/views/cocoa/drag_drop_client_mac_unittest.mm

Index: ui/views/cocoa/drag_drop_client_mac_unittest.mm
diff --git a/ui/views/cocoa/drag_drop_client_mac_unittest.mm b/ui/views/cocoa/drag_drop_client_mac_unittest.mm
index 364b73e0d6991b27205bbb58e3892dc1517a5b94..979010e5a1cee4beb0dbe78cde66f223d24b59b2 100644
--- a/ui/views/cocoa/drag_drop_client_mac_unittest.mm
+++ b/ui/views/cocoa/drag_drop_client_mac_unittest.mm
@@ -10,6 +10,7 @@
 #include "base/mac/sdk_forward_declarations.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
+#import "ui/base/clipboard/clipboard_util_mac.h"
 #import "ui/views/cocoa/bridged_native_widget.h"
 #include "ui/views/test/widget_test.h"
 #include "ui/views/view.h"
@@ -279,17 +280,17 @@ TEST_F(DragDropClientMacTest, InvalidFormatDragDrop) {
 TEST_F(DragDropClientMacTest, PasteboardToOSExchangeTest) {
   target_->set_formats(ui::OSExchangeData::STRING);
 
-  NSPasteboard* pasteboard = [NSPasteboard pasteboardWithUniqueName];
+  scoped_refptr<ui::UniquePasteboard> pasteboard = new ui::UniquePasteboard;
 
   // The test should reject the data if the pasteboard is empty.
-  EXPECT_EQ(DragUpdate(pasteboard), NSDragOperationNone);
+  EXPECT_EQ(DragUpdate(pasteboard->get()), NSDragOperationNone);
   EXPECT_EQ(Drop(), NSDragOperationNone);
   drag_drop_client()->EndDrag();
 
   // Add valid data to the pasteboard and check to see if the target accepts
   // it.
-  [pasteboard setString:@"text" forType:NSPasteboardTypeString];
-  EXPECT_EQ(DragUpdate(pasteboard), NSDragOperationCopy);
+  [pasteboard->get() setString:@"text" forType:NSPasteboardTypeString];
+  EXPECT_EQ(DragUpdate(pasteboard->get()), NSDragOperationCopy);
   EXPECT_EQ(Drop(), NSDragOperationMove);
 }