Remove useless TabDragController::detach_behavior_ and TabDragController::detach_into_browser_

chrome/browser/ui/views/tabs/tab_strip.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_strip.h"
 
 #if defined(OS_WIN)
 #include <windowsx.h>
 #endif
 
@@ skipping 1032 matching lines @@
   }
   DCHECK(!tabs.empty());
   DCHECK(std::find(tabs.begin(), tabs.end(), tab) != tabs.end());
   ui::ListSelectionModel selection_model;
   if (!original_selection.IsSelected(model_index))
     selection_model.Copy(original_selection);
   // Delete the existing DragController before creating a new one. We do this as
   // creating the DragController remembers the WebContents delegates and we need
   // to make sure the existing DragController isn't still a delegate.
   drag_controller_.reset();
-  TabDragController::DetachBehavior detach_behavior =
-      TabDragController::DETACHABLE;
   TabDragController::MoveBehavior move_behavior =
       TabDragController::REORDER;
   // Use MOVE_VISIBILE_TABS in the following conditions:
   // . Mouse event generated from touch and the left button is down (the right
   //   button corresponds to a long press, which we want to reorder).
   // . Gesture begin and control key isn't down.
   // . Real mouse event and control is down. This is mostly for testing.
   DCHECK(event.type() == ui::ET_MOUSE_PRESSED ||
          event.type() == ui::ET_GESTURE_BEGIN);
   if (touch_layout_ &&
       ((event.type() == ui::ET_MOUSE_PRESSED &&
         (((event.flags() & ui::EF_FROM_TOUCH) &&
           static_cast<const ui::MouseEvent&>(event).IsLeftMouseButton()) ||
          (!(event.flags() & ui::EF_FROM_TOUCH) &&
           static_cast<const ui::MouseEvent&>(event).IsControlDown()))) ||
        (event.type() == ui::ET_GESTURE_BEGIN && !event.IsControlDown()))) {
     move_behavior = TabDragController::MOVE_VISIBILE_TABS;
   }
 
   drag_controller_.reset(new TabDragController);
   drag_controller_->Init(
       this, tab, tabs, gfx::Point(x, y), event.x(), selection_model,
-      detach_behavior, move_behavior, EventSourceFromEvent(event));
+      move_behavior, EventSourceFromEvent(event));
 }
 
 void TabStrip::ContinueDrag(views::View* view, const ui::LocatedEvent& event) {
   if (drag_controller_.get() &&
       drag_controller_->event_source() == EventSourceFromEvent(event)) {
     gfx::Point screen_location(event.location());
     views::View::ConvertPointToScreen(view, &screen_location);
     drag_controller_->Drag(screen_location);
   }
 }
@@ skipping 1599 matching lines @@
         action = TouchUMA::GESTURE_TABSWITCH_TAP;
       TouchUMA::RecordGestureAction(action);
       break;
     }
 
     default:
       break;
   }
   event->SetHandled();
 }