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This CL is doing the following:
- Update the BUILD.gn correspondingly with the latest changes
- Adding new patch for using absl optional instead of std
- Update the Support-SHELL-in-chromium patch

Bug: 1072286
Change-Id: Id3c4bc2da5183f92345440eb887f5391f8d7b2e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2153443Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Amr Aboelkher <amraboelkher@google.com>
Commit-Queue: Amr Aboelkher <amraboelkher@google.com>
Cr-Commit-Position: refs/heads/master@{#760979}