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

ui/views/view_unittest.cc

Index: ui/views/view_unittest.cc
diff --git a/ui/views/view_unittest.cc b/ui/views/view_unittest.cc
index 68675c0aa8d0748f74102ea9f7b7e3295d9d9334..2ff4faa564459c4ad85e1b8d9dbdb93d8a1df6aa 100644
--- a/ui/views/view_unittest.cc
+++ b/ui/views/view_unittest.cc
@@ -3431,12 +3431,8 @@ TEST_F(ViewTest, GetViewByID) {
   View::Views views;
   v1.GetViewsInGroup(kGroup, &views);
   EXPECT_EQ(2U, views.size());
-
-  View::Views::const_iterator i(std::find(views.begin(), views.end(), &v3));
-  EXPECT_NE(views.end(), i);
-
-  i = std::find(views.begin(), views.end(), &v4);
-  EXPECT_NE(views.end(), i);
+  EXPECT_NE(views.cend(), std::find(views.cbegin(), views.cend(), &v3));
+  EXPECT_NE(views.cend(), std::find(views.cbegin(), views.cend(), &v4));
 }
 
 TEST_F(ViewTest, AddExistingChild) {