Remove unnecessary uses of aura::Env::GetDispatcher

ash/drag_drop/drag_drop_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 "ash/drag_drop/drag_drop_controller.h"
 
 #include "ash/drag_drop/drag_drop_tracker.h"
 #include "ash/drag_drop/drag_image_view.h"
 #include "ash/shell.h"
 #include "ash/wm/coordinate_conversion.h"
@@ skipping 210 matching lines @@
         drag_image_offset_.y() + drag_image_vertical_offset));
   }
 
   drag_window_ = NULL;
 
   // Ends cancel animation if it's in progress.
   if (cancel_animation_)
     cancel_animation_->End();
 
   if (should_block_during_drag_drop_) {
-    base::RunLoop run_loop(aura::Env::GetInstance()->GetDispatcher());
+    base::RunLoop run_loop;
     quit_closure_ = run_loop.QuitClosure();
     base::MessageLoopForUI* loop = base::MessageLoopForUI::current();
     base::MessageLoop::ScopedNestableTaskAllower allow_nested(loop);
     run_loop.Run();
   }
 
   if (!cancel_animation_.get() || !cancel_animation_->is_animating() ||
       !pending_long_tap_.get()) {
     // If drag cancel animation is running, this cleanup is done when the
     // animation completes.
@@ skipping 315 matching lines @@
     drag_window_->RemoveObserver(this);
   drag_window_ = NULL;
   drag_data_ = NULL;
   // Cleanup can be called again while deleting DragDropTracker, so use Pass
   // instead of reset to avoid double free.
   drag_drop_tracker_.Pass();
 }
 
 }  // namespace internal
 }  // namespace ash