Allow outdirs when !enable_extensions and !enable_print_preview

This lets us generate outdirs for builds where enable_extensions
and enable_print_preview are false. This is a configuration that
is used by Opera's TV SDK.

This can be seen as a fixup to https://codereview.chromium.org/2904443004/ .

BUG=725906

TEST=gn gen --args='enable_extensions=false enable_print_preview=false' out/GnTest

Review-Url: https://codereview.chromium.org/2958243002
Cr-Commit-Position: refs/heads/master@{#483654}
1 file changed