Move TooltipWindowGtk from views/widget to ui/base/gtk.

ui/ui.gyp

 # Copyright (c) 2011 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,
     'toolkit_views2': 0,  # ui/views/ is an experimental framework on Windows.
   },
   'target_defaults': {
@@ skipping 101 matching lines @@
         'base/gtk/gtk_floating_container.h',
         'base/gtk/gtk_im_context_util.cc',
         'base/gtk/gtk_im_context_util.h',
         'base/gtk/gtk_signal.h',
         'base/gtk/gtk_signal_registrar.cc',
         'base/gtk/gtk_signal_registrar.h',
         'base/gtk/gtk_windowing.cc',
         'base/gtk/gtk_windowing.h',
         'base/gtk/owned_widget_gtk.cc',
         'base/gtk/owned_widget_gtk.h',
+        'base/gtk/tooltip_window_gtk.cc',
+        'base/gtk/tooltip_window_gtk.h',
         'base/ime/composition_text.cc',
         'base/ime/composition_text.h',
         'base/ime/composition_underline.h',
         'base/ime/text_input_type.h',
         'base/keycodes/keyboard_code_conversion_gtk.cc',
         'base/keycodes/keyboard_code_conversion_gtk.h',
         'base/keycodes/keyboard_code_conversion_mac.h',
         'base/keycodes/keyboard_code_conversion_mac.mm',
         'base/keycodes/keyboard_code_conversion_win.cc',
         'base/keycodes/keyboard_code_conversion_win.h',
@@ skipping 400 matching lines @@
           'configurations': {
             'Common_Base': {
               'msvs_target_platform': 'x64',
             },
           },
         },
       ],
     }],
   ],
 }