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This applies the mmap workaround to all "Chrome" builds, since we're
also seeing the error on Chrome continuous branch builders, which aren't
marked as "Official" builds.

Review URL: https://chromiumcodereview.appspot.com/10823264

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150905 0039d316-1c4b-4281-b951-d872f2087c98