Views:: Make Labels support text selection.

ui/views/controls/textfield/textfield.cc

Index: ui/views/controls/textfield/textfield.cc
diff --git a/ui/views/controls/textfield/textfield.cc b/ui/views/controls/textfield/textfield.cc
index 2ab27564ee4b4354f377bcfe825d7b0d4949d4b7..2071b04a2284431a82adbeb3e9ad6d88e60d96c9 100644
--- a/ui/views/controls/textfield/textfield.cc
+++ b/ui/views/controls/textfield/textfield.cc
@@ -257,11 +257,6 @@ Textfield::Textfield()
   View::SetBorder(std::unique_ptr<Border>(new FocusableBorder()));
   SetFocusBehavior(FocusBehavior::ALWAYS);
 
-// On Linux, middle click should update or paste the selection clipboard.
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-  selection_controller_.set_handles_selection_clipboard(true);
-#endif
-
   // These allow BrowserView to pass edit commands from the Chrome menu to us
   // when we're focused by simply asking the FocusManager to
   // ProcessAccelerator() with the relevant accelerators.
@@ -1762,6 +1757,10 @@ bool Textfield::IsReadOnly() const {
   return read_only();
 }
 
+bool Textfield::SupportsDrag() const {
+  return true;
+}
+
 void Textfield::SetTextBeingDragged(bool value) {
   initiating_drag_ = value;
 }