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If you modified a file that only affected targets defined in a
non-default toolchain (e.g., like the host toolchain), `gn analyze`
would skip over it and hence not do the right thing. For example,
if you modified //testing/iossim/iossim.mm, analyze would think
that no compile was needed, when really you'd want to recompile
the simulator and re-run every test.

Unfortunately, I don't remember why I wrote the code the way I did,
but looking at it now I can't think of a reason not to just look in
every toolchain.

BUG=667989

Change-Id: I8e1935d7dc23bf49fa87e191c1a136a5492d3678
Reviewed-on: https://chromium-review.googlesource.com/528527Reviewed-by: smut <smut@chromium.org>
Reviewed-by: Brett Wilson <brettw@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#478388}