Remove unused TableViewRowBackgroundPainter class.

ui/views/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//ui/base/ui_features.gni")
 import("//ui/ozone/ozone.gni")
 import("//ui/vector_icons/vector_icons.gni")
@@ skipping 243 matching lines @@
     "controls/tabbed_pane/tabbed_pane.cc",
     "controls/tabbed_pane/tabbed_pane.h",
     "controls/tabbed_pane/tabbed_pane_listener.h",
     "controls/table/table_header.cc",
     "controls/table/table_header.h",
     "controls/table/table_utils.cc",
     "controls/table/table_utils.h",
     "controls/table/table_view.cc",
     "controls/table/table_view.h",
     "controls/table/table_view_observer.h",
-    "controls/table/table_view_row_background_painter.h",
     "controls/textfield/textfield.cc",
     "controls/textfield/textfield.h",
     "controls/textfield/textfield_controller.cc",
     "controls/textfield/textfield_controller.h",
     "controls/textfield/textfield_model.cc",
     "controls/textfield/textfield_model.h",
     "controls/throbber.cc",
     "controls/throbber.h",
     "controls/tree/tree_view.cc",
     "controls/tree/tree_view.h",
@@ skipping 776 matching lines @@
       "//ui/base:test_support",
       "//ui/compositor",
       "//ui/events:test_support",
       "//ui/gl:test_support",
       "//ui/resources",
       "//ui/resources:ui_test_pak",
       "//ui/strings",
     ]
   }
 }