Revert of Implement ui::ClipboardMus.

ui/base/x/selection_utils.cc

Index: ui/base/x/selection_utils.cc
diff --git a/ui/base/x/selection_utils.cc b/ui/base/x/selection_utils.cc
index 2d57e496563e4877aaba25c6c8a022af6cec1121..d7acd52c029070c1437174eba76956eead9e3a9f 100644
--- a/ui/base/x/selection_utils.cc
+++ b/ui/base/x/selection_utils.cc
@@ -20,6 +20,7 @@
 
 namespace ui {
 
+const char kMimeTypeMozillaURL[] = "text/x-moz-url";
 const char kString[] = "STRING";
 const char kText[] = "TEXT";
 const char kTextPlain[] = "text/plain";
@@ -49,7 +50,7 @@
 std::vector< ::Atom> GetURLAtomsFrom(const X11AtomCache* atom_cache) {
   std::vector< ::Atom> atoms;
   atoms.push_back(atom_cache->GetAtom(Clipboard::kMimeTypeURIList));
-  atoms.push_back(atom_cache->GetAtom(Clipboard::kMimeTypeMozillaURL));
+  atoms.push_back(atom_cache->GetAtom(kMimeTypeMozillaURL));
   return atoms;
 }