Do not set the mouse event handler if Widget::SetCapture() fails

chrome/browser/ui/views/tabs/tab_drag_controller.cc

 // Copyright (c) 2012 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 "chrome/browser/ui/views/tabs/tab_drag_controller.h"
 
 #include <math.h>
 #include <set>
 
 #include "ash/accelerators/accelerator_commands.h"
@@ skipping 897 matching lines @@
       tabs[source_tab_index_]->width() +
       static_cast<int>(offset_to_width_ratio_ *
                        tabs[source_tab_index_]->width());
   mouse_offset_.set_x(new_x);
 
   // Transfer ownership of us to the new tabstrip as well as making sure the
   // window has capture. This is important so that if activation changes the
   // drag isn't prematurely canceled.
   attached_tabstrip_->GetWidget()->SetCapture(attached_tabstrip_);
   attached_tabstrip_->OwnDragController(this);
-
-  // Redirect all mouse events to the TabStrip so that the tab that originated
-  // the drag can safely be deleted.
-  static_cast<views::internal::RootView*>(
-      attached_tabstrip_->GetWidget()->GetRootView())->SetMouseHandler(
-          attached_tabstrip_);

[pkotwicz, 2014/07/16 18:50:11]

This call was added a prior date to
attached_tabstrip_->GetWidget()->SetCapture() being added.

 }
 
 void TabDragController::Detach(ReleaseCapture release_capture) {
   TRACE_EVENT1("views", "TabDragController::Detach",
                "release_capture", release_capture);
 
   attach_index_ = -1;
 
   // When the user detaches we assume they want to reorder.
   move_behavior_ = REORDER;
@@ skipping 826 matching lines @@
        it != browser_list->end(); ++it) {
     if ((*it)->tab_strip_model()->empty())
       exclude.insert((*it)->window()->GetNativeWindow());
   }
 #endif
   return GetLocalProcessWindowAtPoint(host_desktop_type_,
                                       screen_point,
                                       exclude);
 
 }