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I got this by change when I ran:
$ gn gen out/Debug_gn --args='os="linux" cpu_arch="arm"'
ERROR at //content/common/BUILD.gn:151:31: Undefined identifier
    if (cpu_arch != "arm" || !is_chromos) {
                             ^---------

BUG=None
TEST=above
TBR=brettw@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/302443002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272685 0039d316-1c4b-4281-b951-d872f2087c98