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This fixes the component=shared_library build on Chrome OS.

BUG=none
TEST=cros chrome-sdk --board=link
  GYP_DEFINES="$GYP_DEFINES component=shared_library" gclient runhooks
  ninja -C out_link/Release chrome chrome_sandbox

Review URL: https://codereview.chromium.org/1136123004

Cr-Commit-Position: refs/heads/master@{#329354}