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).

include/capi/cef_urlrequest_capi.h

@@ -33,7 +33,7 @@
 // by hand. See the translator.README.txt file in the tools directory for
 // more information.
 //
-// $hash=63d875f5a922dd2c2e1efaaf0ddaa20475f79ef8$
+// $hash=75f4f7a9ff628a6ae699a697722caa5d49546784$
 //
 
 #ifndef CEF_INCLUDE_CAPI_CEF_URLREQUEST_CAPI_H_
@@ -115,20 +115,13 @@ typedef struct _cef_urlrequest_t {
 // Create a new URL request that is not associated with a specific browser or
 // frame. Use cef_frame_t::CreateURLRequest instead if you want the request to
 // have this association, in which case it may be handled differently (see
-// documentation on that function). Requests may originate from the both browser
-// process and the render process.
-//
-// For requests originating from the browser process:
+// documentation on that function). A request created with this function may
+// only originate from the browser process, and will behave as follows:
 //   - It may be intercepted by the client via CefResourceRequestHandler or
 //     CefSchemeHandlerFactory.
 //   - POST data may only contain only a single element of type PDE_TYPE_FILE
 //     or PDE_TYPE_BYTES.
 //   - If |request_context| is empty the global request context will be used.
-// For requests originating from the render process:
-//   - It cannot be intercepted by the client so only http(s) and blob schemes
-//     are supported.
-//   - POST data may only contain a single element of type PDE_TYPE_BYTES.
-//   - The |request_context| parameter must be NULL.
 //
 // The |request| object will be marked as read-only after calling this function.
 ///