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/build.patch

@@ -1,8 +1,8 @@
 diff --git build/config/compiler/BUILD.gn build/config/compiler/BUILD.gn
-index 6e219b3994e2..0e14d81370ef 100644
+index 8166e38ceda5..178099b1ac62 100644
 --- build/config/compiler/BUILD.gn
 +++ build/config/compiler/BUILD.gn
-@@ -1742,8 +1742,6 @@ config("thin_archive") {
+@@ -1767,8 +1767,6 @@ config("thin_archive") {
    # archive names to 16 characters, which is not what we want).
    if ((is_posix && !is_nacl && !is_mac && !is_ios) || is_fuchsia) {
      arflags = [ "-T" ]