Remove uses of std::unary_function and std::binary_function.

ash/wm/overview/window_grid.cc

 // Copyright 2014 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/wm/overview/window_grid.h"
 
 #include <algorithm>
 #include <functional>
 #include <set>
 #include <utility>
@@ skipping 50 matching lines @@
     : widget_(std::move(widget)) {}
 
 CleanupWidgetAfterAnimationObserver::~CleanupWidgetAfterAnimationObserver() {
 }
 
 void CleanupWidgetAfterAnimationObserver::OnImplicitAnimationsCompleted() {
   delete this;
 }
 
 // A comparator for locating a given target window.
-struct WindowSelectorItemComparator
-    : public std::unary_function<WindowSelectorItem*, bool> {
+struct WindowSelectorItemComparator {
   explicit WindowSelectorItemComparator(const aura::Window* target_window)
       : target(target_window) {
   }
 
   bool operator()(WindowSelectorItem* window) const {
     return window->GetWindow() == target;
   }
 
   const aura::Window* target;
 };
@@ skipping 424 matching lines @@
         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
     selection_widget_->SetBounds(SelectedWindow()->target_bounds());
     selection_widget_->SetOpacity(255);
     return;
   }
   selection_widget_->SetBounds(SelectedWindow()->target_bounds());
   selection_widget_->SetOpacity(255);
 }
 
 }  // namespace ash