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The target_arch should be ia32 for x86 builders. This is causing the x86 try and
fyi bots to fail during runhooks because it doesnt match a case in common.gypi.

BUG=359644
TBR=cmp@chromium.org

Review URL: https://codereview.chromium.org/581173004

Cr-Commit-Position: refs/heads/master@{#295644}