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).

patch/patch.cfg

@@ -200,6 +200,12 @@ patches = [
   },
   {
     # Support CEF changes in chrome/browser.
+    #
+    # Linux: Fix sharesheet-related linker errors.
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1123388
+    #
+    # Linux: Fix ShareTarget duplicate symbols errors.
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1123395
     'name': 'chrome_browser',
   },
   {
@@ -235,6 +241,9 @@ patches = [
     # Fix fatal error: 'components/printing/common/print.mojom.h' file not found
     # From chrome/browser/ui/browser_commands.cc via
     # chrome/browser/printing/print_view_manager_common.h
+    #
+    # Linux: Fix sharesheet-related linker errors.
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1123388
     'name': 'chrome_browser_net_export',
   },
   {
@@ -249,6 +258,9 @@ patches = [
   },
   {
     # Allow CEF to share Chrome plugin loading code.
+    #
+    # Restore the BrowserPluginGuest::GetEmbedderFrame() method removed in
+    # https://crbug.com/533069#c43.
     'name': 'chrome_plugins',
   },
   {
@@ -406,13 +418,6 @@ patches = [
     # Compute correct default quota when cache_path is unspecified.
     'name': 'services_network_2718',
   },
-  {
-    # Windows: Remove the base::Value is_standard_layout assert which will fail
-    # for the cef_sandbox build, and which is no longer required.
-    # https://bugs.chromium.org/p/chromium/issues/detail?id=646113#c173
-    # https://chromium.googlesource.com/chromium/src/+/2f28731c17
-    'name': 'win_base_msvc_sandbox',
-  },
   {
     # Restore WebView::SetResizeBackgroundColor() that was removed.
     # http://crrev.com/3955c9f9eb
@@ -485,11 +490,6 @@ patches = [
     # https://chromium-review.googlesource.com/c/chromium/src/+/1884750
     'name': 'libxml_visibility',
   },
-  {
-    # Fix ScreenlockMonitorDeviceSource window creation error.
-    # https://bugs.chromium.org/p/chromium/issues/detail?id=1058556
-    'name': 'win_screenlock_1058556',
-  },
   {
     # Fix unbound AssociatedRemote error in SetBackgroundOpaque.
     # https://bugs.chromium.org/p/chromium/issues/detail?id=1070713
@@ -511,5 +511,16 @@ patches = [
     # Fix build errors with enable_background_mode=false.
     # https://bugs.chromium.org/p/chromium/issues/detail?id=1100085
     'name': 'chrome_browser_background_mode_1100085',
+  },
+  {
+    # Windows: Fix flickering issue with GPU rendering.
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1123950
+    'name': 'ui_gl_utils_1123950',
+  },
+  {
+    # Windows: Fix cef_sandbox compile error due to missing include.
+    # Fixed by the below change in more recent Chromium versions.
+    # https://bugs.chromium.org/p/chromium/issues/detail?id=1049498#c14
+    'name': 'base_string_piece_1049498',
   }
 ]