Replace "nested message loop" with "nested run loop" in comments.

ui/views/controls/menu/menu_controller_unittest.cc

 // Copyright 2014 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 "ui/views/controls/menu/menu_controller.h"
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 135 matching lines @@
   }
 
   int outstanding_touches() const { return outstanding_touches_; }
 
  private:
   int outstanding_touches_;
   DISALLOW_COPY_AND_ASSIGN(TestEventHandler);
 };
 
 #if defined(USE_AURA)
-// A DragDropClient which does not trigger a nested message loop. Instead a
+// A DragDropClient which does not trigger a nested run loop. Instead a
 // callback is triggered during StartDragAndDrop in order to allow testing.
 class TestDragDropClient : public aura::client::DragDropClient {
  public:
   explicit TestDragDropClient(const base::Closure& callback)
       : start_drag_and_drop_callback_(callback), drag_in_progress_(false) {}
   ~TestDragDropClient() override {}
 
   // aura::client::DragDropClient:
   int StartDragAndDrop(const ui::OSExchangeData& data,
                        aura::Window* root_window,
@@ skipping 1246 matching lines @@
   // crash.
   TestAsyncEscapeKey();
   EXPECT_EQ(nested_controller_delegate_2->on_menu_closed_called(), 1);
   EXPECT_EQ(menu_controller_delegate(), GetCurrentDelegate());
 }
 
 #endif  // defined(USE_AURA)
 
 }  // namespace test
 }  // namespace views