This disables header checking for split static libraries. In addition to the internal issues discussed in the added comment to split_static_library.gni, there is a circular include cycle between //chrome/browser and //chrome/browser/ui. Both of these are split static libraries, so enabling check for this configuration would additionally require listing all of the split ui targets in the allow_circular_includes_from annotation in the browser target.

Since this is only for official builds, we still get header checking on the normal builds so there should be no missing coverage for header checking.

R=dpranke@chromium.org

Review-Url: https://codereview.chromium.org/2363083003
Cr-Commit-Position: refs/heads/master@{#420705}