[Reland] Fix crash when accidentally touching the screen during a multi window resize

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 1130 matching lines @@
   if (touch_layout_.get() &&
       ((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;
   }
 
-  views::Widget* widget = GetWidget();
 #if defined(OS_WIN)
   // It doesn't make sense to drag tabs out on Win8's single window Metro mode.
   if (win8::IsSingleWindowMetroMode())
     detach_behavior = TabDragController::NOT_DETACHABLE;
 #endif
-  // Gestures don't automatically do a capture. We don't allow multiple drags at
-  // the same time, so we explicitly capture.
-  if (event.type() == ui::ET_GESTURE_BEGIN)
-    widget->SetCapture(this);
   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));
 }
 
 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());
@@ skipping 1604 matching lines @@
 #if defined(USE_AURA)
   return chrome::GetHostDesktopTypeForNativeView(
       GetWidget()->GetNativeView()) == chrome::HOST_DESKTOP_TYPE_ASH;
 #else
   if (ui::GetDisplayLayout() != ui::LAYOUT_TOUCH)
     return false;
 #endif
 
   return true;
 }