Delete some unused code found by -Wunused-function

chrome/browser/ui/panels/base_panel_browser_test.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/base_panel_browser_test.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
@@ skipping 160 matching lines @@
     DesktopBarAlignment alignment, int thickness) {
   MockDesktopBar* bar = &(mock_desktop_bars[static_cast<int>(alignment)]);
   if (!bar->auto_hiding_enabled)
     return;
   if (thickness == bar->thickness)
     return;
   bar->thickness = thickness;
   OnAutoHidingDesktopBarChanged();
 }
 
-bool ExistsPanel(Panel* panel) {
-  std::vector<Panel*> panels = PanelManager::GetInstance()->panels();
-  return std::find(panels.begin(), panels.end(), panel) != panels.end();
-}
-
 }  // namespace
 
 const FilePath::CharType* BasePanelBrowserTest::kTestDir =
     FILE_PATH_LITERAL("panels");
 
 BasePanelBrowserTest::BasePanelBrowserTest()
     : InProcessBrowserTest(),
       mock_display_settings_enabled_(true) {
 }
 
@@ skipping 272 matching lines @@
 }
 
 void BasePanelBrowserTest::MoveMouse(const gfx::Point& position) {
   PanelManager::GetInstance()->mouse_watcher()->NotifyMouseMovement(position);
 }
 
 std::string BasePanelBrowserTest::MakePanelName(int index) {
   std::string panel_name("Panel");
   return panel_name + base::IntToString(index);
 }