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This CL enables users in headless mode to specify download.default_directory using
dot notation rather than constructing a nested dictionary. Support for
the nested syntax is maintained. This matches the behavior for headed mode.

Bug: chromedriver:3106
Change-Id: I8b225b83272b5ab15d176603bf6df43493c64a4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1779427Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Tricia Crichton <triciac@chromium.org>
Cr-Commit-Position: refs/heads/master@{#692278}