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/webview_plugin_2020.patch

@@ -1,8 +1,8 @@
 diff --git chrome/app/generated_resources.grd chrome/app/generated_resources.grd
-index 30da9de5bf78..29366b337312 100644
+index 007d476f22ce..106ddd21a532 100644
 --- chrome/app/generated_resources.grd
 +++ chrome/app/generated_resources.grd
-@@ -4963,7 +4963,7 @@ Keep your key file in a safe place. You will need it to create new versions of y
+@@ -4984,7 +4984,7 @@ Keep your key file in a safe place. You will need it to create new versions of y
          </message>
        </if>
        <message name="IDS_PLUGIN_BLOCKED_BY_POLICY" desc="The placeholder text for a plugin blocked by enterprise policy.">