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This makes make_global_settings closer to the GYP version. Previously it had relied on GYP concatenating two lists when running with goma, but it doesn't actually behave this way, resulting in unexpected output.

TBR=scottmg

Review URL: https://codereview.chromium.org/132833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244104 0039d316-1c4b-4281-b951-d872f2087c98