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

patch/patches/chrome_browser.patch

@@ -1,5 +1,5 @@
 diff --git chrome/browser/BUILD.gn chrome/browser/BUILD.gn
-index 477e30a34cd2..7a24ff410e7e 100644
+index 021b133ee20e..3282a16ad86c 100644
 --- chrome/browser/BUILD.gn
 +++ chrome/browser/BUILD.gn
 @@ -11,6 +11,7 @@ import("//build/config/features.gni")
@@ -8,9 +8,9 @@ index 477e30a34cd2..7a24ff410e7e 100644
  import("//build/config/ui.gni")
 +import("//cef/libcef/features/features.gni")
  import("//chrome/browser/buildflags.gni")
+ import("//chrome/browser/downgrade/buildflags.gni")
  import("//chrome/common/features.gni")
- import("//components/captive_portal/core/features.gni")
-@@ -1956,6 +1957,7 @@ jumbo_static_library("browser") {
+@@ -1975,6 +1976,7 @@ jumbo_static_library("browser") {
      "//base/util/values:values_util",
      "//build:branding_buildflags",
      "//cc",
@@ -18,7 +18,7 @@ index 477e30a34cd2..7a24ff410e7e 100644
      "//chrome:extra_resources",
      "//chrome:resources",
      "//chrome:strings",
-@@ -2275,6 +2277,10 @@ jumbo_static_library("browser") {
+@@ -2296,6 +2298,10 @@ jumbo_static_library("browser") {
      ]
    }