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This is a reland of e0dffd84.
706934 fixed the compile issue with headless code and the
issues with the delayloads_unittests have been resolved.

Original change's description:
> Set is_multi_dll_chrome to false by default
>
> This change sets is_multi_dll_chrome to false by default thus merging
> chrome.dll and chrome_child.dll to a single dll.  This saves disk space
> and improves startup performance.  It is also consistent with all other
> platforms (windows was the only platform the split was enabled by
> default).
>
> Bug: 726150
> Change-Id: Iade2c7f1bbe696d45ebac7483072f7e2e7e84ab4
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1850272
> Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
> Reviewed-by: Will Harris <wfh@chromium.org>
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Nico Weber <thakis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#705667}

Bug: 726150
Change-Id: I8261e781102e23b2c2319a181295655dfda3b811
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1868389Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Will Harris <wfh@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708042}