Update to Chromium version 86.0.4240.0 (#800218)

- CefURLRequest::Create is no longer supported in the renderer process
  (see https://crbug.com/891872). Use CefFrame::CreateURLRequest instead.
- Mac platform definitions have been changed from `MACOSX` to `MAC`
  (see https://crbug.com/1105907) and related CMake macro names have
  been updated. The old `OS_MACOSX` define is still set in code and CMake
  for backwards compatibility.
- Linux ARM build is currently broken (see https://crbug.com/1123214).

patch/patches/base_string_piece_1049498.patch

@@ -0,0 +1,12 @@
+diff --git base/strings/string_piece.h base/strings/string_piece.h
+index c650cfa84d59..0d6ff1ab5684 100644
+--- base/strings/string_piece.h
++++ base/strings/string_piece.h
+@@ -24,6 +24,7 @@
+ 
+ #include <stddef.h>
+ 
++#include <algorithm>
+ #include <iosfwd>
+ #include <ostream>
+ #include <string>