Revert of Implement ui::ClipboardMus.

ui/base/clipboard/clipboard_constants.cc

Index: ui/base/clipboard/clipboard_constants.cc
diff --git a/ui/base/clipboard/clipboard_constants.cc b/ui/base/clipboard/clipboard_constants.cc
index 6372353925ea40962536c6588a3265f4a69a4d1b..2d499dcf4d0b828c2126ca4efbe2fb075ee3a6e3 100644
--- a/ui/base/clipboard/clipboard_constants.cc
+++ b/ui/base/clipboard/clipboard_constants.cc
@@ -8,15 +8,9 @@
 
 const char Clipboard::kMimeTypeText[] = "text/plain";
 const char Clipboard::kMimeTypeURIList[] = "text/uri-list";
-const char Clipboard::kMimeTypeMozillaURL[] = "text/x-moz-url";
 const char Clipboard::kMimeTypeDownloadURL[] = "downloadurl";
 const char Clipboard::kMimeTypeHTML[] = "text/html";
 const char Clipboard::kMimeTypeRTF[] = "text/rtf";
 const char Clipboard::kMimeTypePNG[] = "image/png";
-// TODO(dcheng): This name is temporary. See crbug.com/106449.
-const char Clipboard::kMimeTypeWebCustomData[] = "chromium/x-web-custom-data";
-const char Clipboard::kMimeTypeWebkitSmartPaste[] = "chromium/x-webkit-paste";
-const char Clipboard::kMimeTypePepperCustomData[] =
-    "chromium/x-pepper-custom-data";
 
 }  // namespace ui