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We need to do this because when doing a PGO build the /GL flag gets automatically set everywhere, and we're hitting this warning: https://msdn.microsoft.com/en-us/library/b8s7ctwz%28v=vs.90%29.aspx because of the custom memset implementation (https://code.google.com/p/chromium/codesearch#chromium/src/chrome/installer/mini_installer/mini_installer.cc&q=mini_ins&sq=package:chromium&l=862)

TBR=robertshield@chromium.org
BUG=309849

Review URL: https://codereview.chromium.org/1035893002

Cr-Commit-Position: refs/heads/master@{#322377}