Fixes for -Wunused-function on Linux, Android and ChromeOS

ash/shell_unittest.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 "ash/shell.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/ash_switches.h"
@@ skipping 441 matching lines @@
   widget->Restore();
   EXPECT_EQ(
       SHELF_VISIBLE,
       Shell::GetPrimaryRootWindowController()->
           GetShelfLayoutManager()->visibility_state());
 
   // Clean up.
   widget->Close();
 }
 
-namespace {
-
-// Builds the list of parents from |window| to the root. The returned vector is
-// in reverse order (|window| is first).
-std::vector<aura::Window*> BuildPathToRoot(aura::Window* window) {
-  std::vector<aura::Window*> results;
-  while (window) {
-    results.push_back(window);
-    window = window->parent();
-  }
-  return results;
-}
-
-}  // namespace
-
 // Various assertions around SetShelfAutoHideBehavior() and
 // GetShelfAutoHideBehavior().
 TEST_F(ShellTest, ToggleAutoHide) {
   scoped_ptr<aura::Window> window(new aura::Window(NULL));
   window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_NORMAL);
   window->SetType(aura::client::WINDOW_TYPE_NORMAL);
   window->Init(ui::LAYER_TEXTURED);
   ParentWindowInPrimaryRootWindow(window.get());
   window->Show();
   wm::ActivateWindow(window.get());
@@ skipping 59 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellTest2);
 };
 
 TEST_F(ShellTest2, DontCrashWhenWindowDeleted) {
   window_.reset(new aura::Window(NULL));
   window_->Init(ui::LAYER_NOT_DRAWN);
 }
 
 }  // namespace ash