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Existing code will not build when building chromeos_unittests target following the simple chrome build instruction
http://www.chromium.org/chromium-os/how-tos-and-troubleshooting/building-chromium-browser
with BOARD=x86-generic, for example.

TEST=chromeos_unittest built successfully following the instruction above, and the test passed.

Review-Url: https://codereview.chromium.org/2344893002
Cr-Commit-Position: refs/heads/master@{#419128}