Linux: Remove --wm-user-time-ms command line argument

ui/base/x/selection_owner.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/base/x/selection_owner.h"
 
 #include <algorithm>
 #include <X11/Xlib.h>
 #include <X11/Xatom.h>
 
@@ skipping 100 matching lines @@
 
 void SelectionOwner::RetrieveTargets(std::vector<XAtom>* targets) {
   for (SelectionFormatMap::const_iterator it = format_map_.begin();
        it != format_map_.end(); ++it) {
     targets->push_back(it->first);
   }
 }
 
 void SelectionOwner::TakeOwnershipOfSelection(
     const SelectionFormatMap& data) {
-  // Save the last server timestamp seen from X, to satisfy requests for the
-  // TIMESTAMP target later…
-  acquired_selection_timestamp_ =
-      X11EventSource::GetInstance()->last_seen_server_time();
-  // …but always pass CurrentTime to XSetSelectionOwner to increase the chances
-  // of this succeeding.
-  XSetSelectionOwner(x_display_, selection_name_, x_window_, CurrentTime);
+  acquired_selection_timestamp_ = X11EventSource::GetInstance()->GetTimestamp();
+  XSetSelectionOwner(x_display_, selection_name_, x_window_,
+                     acquired_selection_timestamp_);
 
   if (XGetSelectionOwner(x_display_, selection_name_) == x_window_) {
     // The X server agrees that we are the selection owner. Commit our data.
     format_map_ = data;
   }
 }
 
 void SelectionOwner::ClearSelectionOwner() {
   XSetSelectionOwner(x_display_, selection_name_, None, CurrentTime);
   format_map_ = SelectionFormatMap();
@@ skipping 250 matching lines @@
       foreign_window_manager_id(foreign_window_manager_id) {
 }
 
 SelectionOwner::IncrementalTransfer::IncrementalTransfer(
     const IncrementalTransfer& other) = default;
 
 SelectionOwner::IncrementalTransfer::~IncrementalTransfer() {
 }
 
 }  // namespace ui