Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/panels/test_panel_mouse_watcher.h

Index: chrome/browser/ui/panels/test_panel_mouse_watcher.h
diff --git a/chrome/browser/ui/panels/test_panel_mouse_watcher.h b/chrome/browser/ui/panels/test_panel_mouse_watcher.h
deleted file mode 100644
index 64d4030088755d1b164d5a463e8b5a4c53bfb0fb..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/panels/test_panel_mouse_watcher.h
+++ /dev/null
@@ -1,31 +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.
-
-#ifndef CHROME_BROWSER_UI_PANELS_TEST_PANEL_MOUSE_WATCHER_H_
-#define CHROME_BROWSER_UI_PANELS_TEST_PANEL_MOUSE_WATCHER_H_
-
-#include "base/macros.h"
-#include "chrome/browser/ui/panels/panel_mouse_watcher.h"
-#include "ui/gfx/geometry/point.h"
-
-// Test mouse watcher for simulating mouse movements in tests.
-class TestPanelMouseWatcher : public PanelMouseWatcher {
- public:
-  TestPanelMouseWatcher();
-  ~TestPanelMouseWatcher() override;
-
- private:
-  void Start() override;
-  void Stop() override;
-  bool IsActive() const override;
-
-  void NotifyMouseMovement(const gfx::Point& mouse_position) override;
-  gfx::Point GetMousePosition() const override;
-
-  bool started_;
-  gfx::Point mouse_position_;
-  DISALLOW_COPY_AND_ASSIGN(TestPanelMouseWatcher);
-};
-
-#endif  // CHROME_BROWSER_UI_PANELS_TEST_PANEL_MOUSE_WATCHER_H_