Update to Chromium version 82.0.4085.0 (#749737)

- Building on macOS now requires the 10.15 SDK. Xcode 11.3 is recommended as
  Xcode 11.4 is not currently supported (see https://crbug.com/1065146).
- Jumbo build configuration is no longer supported.

Chromium is skipping the M82 release and consequently no CEF 4085 branch will
be created. For details on the Chromium decision see
https://groups.google.com/a/chromium.org/d/msg/chromium-dev/Vn7uzglqLz0/JItlSrZxBAAJ

include/internal/cef_types.h

@@ -2237,7 +2237,13 @@ typedef enum {
   CT_ZOOMOUT,
   CT_GRAB,
   CT_GRABBING,
+  CT_MIDDLE_PANNING_VERTICAL,
+  CT_MIDDLE_PANNING_HORIZONTAL,
   CT_CUSTOM,
+  CT_DND_NONE,
+  CT_DND_MOVE,
+  CT_DND_COPY,
+  CT_DND_LINK,
 } cef_cursor_type_t;
 
 ///