Remove views::SingleSplitView as it's presently unused.

ui/views/examples/double_split_view_example.cc

Index: ui/views/examples/double_split_view_example.cc
diff --git a/ui/views/examples/double_split_view_example.cc b/ui/views/examples/double_split_view_example.cc
deleted file mode 100644
index 78ecfc1d83330d7a2fa44f529d29b2dbdb9660d8..0000000000000000000000000000000000000000
--- a/ui/views/examples/double_split_view_example.cc
+++ /dev/null
@@ -1,83 +0,0 @@
-// 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 "ui/views/examples/double_split_view_example.h"
-
-#include "base/macros.h"
-#include "ui/views/background.h"
-#include "ui/views/controls/single_split_view.h"
-#include "ui/views/layout/grid_layout.h"
-
-namespace views {
-namespace examples {
-
-namespace {
-
-// DoubleSplitViews's content, which draws gradient color on background.
-class SplittedView : public View {
- public:
-  SplittedView();
-  ~SplittedView() override;
-
-  void SetColor(SkColor from, SkColor to);
-
-  // View:
-  gfx::Size GetMinimumSize() const override;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(SplittedView);
-};
-
-SplittedView::SplittedView() {
-  SetColor(SK_ColorRED, SK_ColorGREEN);
-}
-
-SplittedView::~SplittedView() {
-}
-
-void SplittedView::SetColor(SkColor from, SkColor to) {
-  set_background(Background::CreateVerticalGradientBackground(from, to));
-}
-
-gfx::Size SplittedView::GetMinimumSize() const {
-  return gfx::Size(10, 10);
-}
-
-}  // namespace
-
-DoubleSplitViewExample::DoubleSplitViewExample()
-    : ExampleBase("Double Split View") {
-}
-
-DoubleSplitViewExample::~DoubleSplitViewExample() {
-}
-
-void DoubleSplitViewExample::CreateExampleView(View* container) {
-  SplittedView* splitted_view_1 = new SplittedView();
-  SplittedView* splitted_view_2 = new SplittedView();
-  SplittedView* splitted_view_3 = new SplittedView();
-
-  inner_single_split_view_ = new SingleSplitView(
-      splitted_view_1, splitted_view_2,
-      SingleSplitView::HORIZONTAL_SPLIT,
-      NULL);
-
-  outer_single_split_view_ = new SingleSplitView(
-      inner_single_split_view_, splitted_view_3,
-      SingleSplitView::HORIZONTAL_SPLIT,
-      NULL);
-
-  GridLayout* layout = new GridLayout(container);
-  container->SetLayoutManager(layout);
-
-  // Add scroll view.
-  ColumnSet* column_set = layout->AddColumnSet(0);
-  column_set->AddColumn(GridLayout::FILL, GridLayout::FILL, 1,
-                        GridLayout::USE_PREF, 0, 0);
-  layout->StartRow(1, 0);
-  layout->AddView(outer_single_split_view_);
-}
-
-}  // namespace examples
-}  // namespace views