Use RenderText directly to draw tooltip

ui/views/views.gyp

 # 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.
 {
   'variables': {
     'chromium_code': 1,
     # Sources lists shared with GN build.
     'views_sources': [
       'accessibility/native_view_accessibility.cc',
       'accessibility/native_view_accessibility.h',
@@ skipping 551 matching lines @@
       'widget/native_widget_mac_unittest.mm',
       'widget/native_widget_unittest.cc',
       'widget/root_view_unittest.cc',
       'widget/widget_unittest.cc',
       'widget/window_reorderer_unittest.cc',
       'window/custom_frame_view_unittest.cc',
       'window/dialog_client_view_unittest.cc',
       'window/dialog_delegate_unittest.cc',
     ],
     'views_unittests_aura_sources': [
-      'corewm/tooltip_aura_unittest.cc',
       'corewm/tooltip_controller_unittest.cc',
       'touchui/touch_selection_controller_impl_unittest.cc',
     ],
     'views_unittests_desktop_aura_sources': [
       'widget/desktop_aura/desktop_focus_rules_unittest.cc',
       'widget/desktop_aura/desktop_native_widget_aura_unittest.cc',
       'widget/desktop_aura/desktop_screen_position_client_unittest.cc',
     ],
     'views_unittests_desktop_aurax11_sources': [
       'widget/desktop_aura/desktop_drag_drop_client_aurax11_unittest.cc',
@@ skipping 329 matching lines @@
                 '../aura/aura.gyp:aura',
                 '../wm/wm.gyp:wm',
               ],
             }],
           ],
         },  # target_name: macviews_interactive_ui_tests
       ],  # targets
     }],
   ],  # conditions
 }