Support 'Paste and Go' action in omnibox Aura.

ui/base/clipboard/clipboard_gtk.cc

Index: ui/base/clipboard/clipboard_gtk.cc
diff --git a/ui/base/clipboard/clipboard_gtk.cc b/ui/base/clipboard/clipboard_gtk.cc
index b1d7880ba7c1d8da56bb7e342f1368414222bd39..78eebbae6e45468f3d63d00aa33b8ca4bb8fbde0 100644
--- a/ui/base/clipboard/clipboard_gtk.cc
+++ b/ui/base/clipboard/clipboard_gtk.cc
@@ -636,6 +636,16 @@ const Clipboard::FormatType& Clipboard::GetPlainTextWFormatType() {
 }
 
 // static
+const Clipboard::FormatType& Clipboard::GetUrlFormatType() {
+  return GetPlainTextFormatType();
+}
+
+// static
+const Clipboard::FormatType& Clipboard::GetUrlWFormatType() {
+  return GetPlainTextWFormatType();
+}
+
+// static
 const Clipboard::FormatType& Clipboard::GetHtmlFormatType() {
   CR_DEFINE_STATIC_LOCAL(FormatType, type, (kMimeTypeHTML));
   return type;