Avoids releasing capture prematurily when dragging tabs from one to another browser window

chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.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_interactive_uitest.h"
 
 #include "ash/wm/window_state.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 307 matching lines @@
   // changes capture is released and the drag cancels.
   frame->ReleaseCaptureOnNextClear();
   ASSERT_TRUE(ui_test_utils::SendMouseMoveSync(tab_0_center));
   EXPECT_FALSE(tab_strip->IsDragSessionActive());
 }
 
 IN_PROC_BROWSER_TEST_F(TabDragControllerTest, GestureEndShouldEndDragTest) {
   AddTabAndResetBrowser(browser());
 
   TabStrip* tab_strip = GetTabStripForBrowser(browser());
-  TabStripModel* model = browser()->tab_strip_model();
 
   Tab* tab1 = tab_strip->tab_at(1);
   gfx::Point tab_1_center(tab1->width() / 2, tab1->height() / 2);
 
   ui::GestureEvent gesture_begin(ui::ET_GESTURE_BEGIN, tab_1_center.x(),
       tab_1_center.x(), 0, base::TimeDelta(),
       ui::GestureEventDetails(ui::ET_GESTURE_BEGIN, 0.0f, 0.0f), 0);
   tab_strip->MaybeStartDrag(tab1, gesture_begin,
     tab_strip->GetSelectionModel());
   //tab_strip->tab_at(1)->OnGestureEvent(&gesture_begin);
@@ skipping 1993 matching lines @@
                         DetachToDockedTabDragControllerTest,
                         ::testing::Values("mouse", "mouse docked"));
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserTabDragControllerTestTouch,
                         ::testing::Values("touch", "touch docked"));
 #else
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserTabDragControllerTest,
                         ::testing::Values("mouse"));
 #endif