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.

tools/make_libcef_dll_dylib_impl.py

@@ -60,7 +60,10 @@ def make_libcef_dll_dylib_impl_func(func):
 
 def make_libcef_dll_dylib_impl(header):
   filenames = []
-  includes = []
+  includes = [
+      '#include "include/base/cef_compiler_specific.h"',
+      '#include "include/wrapper/cef_library_loader.h"',
+  ]
   ptr_typedef = ''
   ptr_declare = ''
   ptr_init = ''
@@ -119,7 +122,6 @@ def make_libcef_dll_dylib_impl(header):
 #include <stdio.h>
 
 """ + "\n".join(sorted(includes)) + """
-#include "include/wrapper/cef_library_loader.h"
 
 // GLOBAL WRAPPER FUNCTIONS - Do not edit by hand.