Allow use of container cbegin() and cend() methods, plus sample uses.

ui/views/widget/desktop_aura/x11_topmost_window_finder_interactive_uitest.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 "ui/views/widget/desktop_aura/x11_topmost_window_finder.h"
 
 #include <stddef.h>
 #include <X11/extensions/shape.h>
 #include <X11/Xlib.h>
 #include <X11/Xregion.h>
@@ skipping 37 matching lines @@
     atom_cache_.reset(new ui::X11AtomCache(gfx::GetXDisplay(), kAtomsToCache));
   }
 
   ~MinimizeWaiter() override {}
 
  private:
   // X11PropertyChangeWaiter:
   bool ShouldKeepOnWaiting(const ui::PlatformEvent& event) override {
     std::vector<Atom> wm_states;
     if (ui::GetAtomArrayProperty(xwindow(), "_NET_WM_STATE", &wm_states)) {
-      std::vector<Atom>::iterator it = std::find(
-          wm_states.begin(),
-          wm_states.end(),
-          atom_cache_->GetAtom("_NET_WM_STATE_HIDDEN"));
-      return it == wm_states.end();
+      auto it = std::find(wm_states.cbegin(), wm_states.cend(),
+                          atom_cache_->GetAtom("_NET_WM_STATE_HIDDEN"));
+      return it == wm_states.cend();
     }
     return true;
   }
 
   scoped_ptr<ui::X11AtomCache> atom_cache_;
 
   DISALLOW_COPY_AND_ASSIGN(MinimizeWaiter);
 };
 
 // Waits till |_NET_CLIENT_LIST_STACKING| is updated to include
@@ skipping 17 matching lines @@
 
     X11PropertyChangeWaiter::Wait();
   }
 
  private:
   // X11PropertyChangeWaiter:
   bool ShouldKeepOnWaiting(const ui::PlatformEvent& event) override {
     std::vector<XID> stack;
     ui::GetXWindowStack(ui::GetX11RootWindow(), &stack);
     for (size_t i = 0; i < expected_windows_.size(); ++i) {
-      std::vector<XID>::iterator it = std::find(
-          stack.begin(), stack.end(), expected_windows_[i]);
-      if (it == stack.end())
+      auto it = std::find(stack.cbegin(), stack.cend(), expected_windows_[i]);
+      if (it == stack.cend())
         return true;
     }
     return false;
   }
 
   std::vector<XID> expected_windows_;
 
   DISALLOW_COPY_AND_ASSIGN(StackingClientListWaiter);
 };
 
@@ skipping 322 matching lines @@
 
   EXPECT_EQ(xid, FindTopmostXWindowAt(110, 110));
   EXPECT_EQ(menu_xid, FindTopmostXWindowAt(150, 120));
   EXPECT_EQ(menu_xid, FindTopmostXWindowAt(210, 120));
 
   XDestroyWindow(xdisplay(), xid);
   XDestroyWindow(xdisplay(), menu_xid);
 }
 
 }  // namespace views