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

libcef/browser/browser_main.cc

@@ -36,7 +36,6 @@
 #include "extensions/common/constants.h"
 #include "net/base/net_module.h"
 #include "services/service_manager/embedder/result_codes.h"
-#include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/resource/resource_bundle.h"
 
 #if defined(USE_AURA) && defined(USE_X11)
@@ -161,8 +160,6 @@ void CefBrowserMainParts::PreMainMessageLoopRun() {
   display::Screen::SetScreenInstance(views::CreateDesktopScreen());
 #endif
 
-  ui::MaterialDesignController::Initialize();
-
   if (extensions::ExtensionsEnabled()) {
     // Initialize extension global objects before creating the global
     // BrowserContext.