mac: Don't lose pixels when copying a retina image from the clipboard.

ui/base/clipboard/clipboard_mac_unittest.mm

Index: ui/base/clipboard/clipboard_mac_unittest.mm
diff --git a/ui/base/clipboard/clipboard_mac_unittest.mm b/ui/base/clipboard/clipboard_mac_unittest.mm
index 9b60f7aad0b5ff2ef23de70f39f7f7f9f800c9e0..ce5eb41bfb6d32595b05e48f83a5122114476b40 100644
--- a/ui/base/clipboard/clipboard_mac_unittest.mm
+++ b/ui/base/clipboard/clipboard_mac_unittest.mm
@@ -53,8 +53,8 @@ TEST_F(ClipboardMacTest, ReadImageRetina) {
 
   SkBitmap bitmap = clipboard_mac->ReadImage(ui::CLIPBOARD_TYPE_COPY_PASTE,
                                              pasteboard->get());
-  EXPECT_EQ(width, bitmap.width());
-  EXPECT_EQ(height, bitmap.height());
+  EXPECT_EQ(2 * width, bitmap.width());
+  EXPECT_EQ(2 * height, bitmap.height());
 }
 
 TEST_F(ClipboardMacTest, ReadImageNonRetina) {