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Without above change it breaks the build for Crosswalk which is dependent on
content and components like devtools_http_handler. This is somehow not evident
on Chrome or Content Shell builds which might be including base/values.h through
some other includes.

R=pfeldman@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1137243005

Cr-Commit-Position: refs/heads/master@{#330581}