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Currently linux-jumbo-rel, the CQ bot, builds with the default
jumbo chunk size, and since it uses goma that is 8. Building
with relatively small chunks (8) means that it doesn't notice
symbol clashes that happen with larger chunks so it's better to
build with the non-goma default, 50.

This will slightly reduce parallelism of builds, and might trigger
more files to be recompiled for changes, but it will also bring
along with it the benefits of larger jumbo chunks (less CPU cycles
spent per compiled cc file, faster linking) so it's not obvious
how it will affect performance, if at all.

Bug: 905588
Change-Id: I950ef63093f60580e98891aa0f556fa57b5d6628
Reviewed-on: https://chromium-review.googlesource.com/c/1337496Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Daniel Bratell <bratell@opera.com>
Cr-Commit-Position: refs/heads/master@{#608822}