Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/panels/test_panel_mouse_watcher.cc

-// 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 "chrome/browser/ui/panels/test_panel_mouse_watcher.h"
-
-#include "testing/gtest/include/gtest/gtest.h"
-
-TestPanelMouseWatcher::TestPanelMouseWatcher()
-    : started_(false) {
-}
-
-TestPanelMouseWatcher::~TestPanelMouseWatcher() {
-  EXPECT_FALSE(IsActive());
-}
-
-void TestPanelMouseWatcher::Start() {
-  EXPECT_FALSE(IsActive());
-  started_ = true;
-}
-
-void TestPanelMouseWatcher::Stop() {
-  EXPECT_TRUE(IsActive());
-  started_ = false;
-}
-
-bool TestPanelMouseWatcher::IsActive() const {
-  return started_;
-}
-
-void TestPanelMouseWatcher::NotifyMouseMovement(
-    const gfx::Point& mouse_position) {
-  mouse_position_ = mouse_position;
-  PanelMouseWatcher::NotifyMouseMovement(mouse_position);
-}
-
-gfx::Point TestPanelMouseWatcher::GetMousePosition() const {
-  return mouse_position_;
-}