Various fixes related to the C++11/14 update (see issue #3140)

- Convert scoped_ptr to std::unique_ptr from <memory>
- Convert arraysize to base::size from include/base/cef_cxx17_backports.h
- Convert NULL to nullptr
- Include include/base/cef_callback.h instead of include/base/cef_bind.h
- Implicit conversion of CefRefPtr<T> or scoped_refptr<T> to T* is gone;
  use .get() instead

See the issue for additional details.

tests/cefclient/browser/views_window.cc

@@ -6,8 +6,8 @@
 
 #include <algorithm>
 
-#include "include/base/cef_bind.h"
 #include "include/base/cef_build.h"
+#include "include/base/cef_callback.h"
 #include "include/cef_app.h"
 #include "include/views/cef_box_layout.h"
 #include "include/wrapper/cef_helpers.h"
@@ -313,7 +313,7 @@ void ViewsWindow::OnExtensionsChanged(const ExtensionSet& extensions) {
       image_set.push_back(
           ImageCache::ImageInfo::Create1x(icon_path, icon_path, internal));
     } else {
-      // Get a NULL image and use the default icon.
+      // Get a nullptr image and use the default icon.
       image_set.push_back(ImageCache::ImageInfo::Empty());
     }
   }