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Found by Facebook's flint tool:
$ flint ui/gfx/x/x11_error_tracker.cc
ui/gfx/x/x11_error_tracker.cc:6: The associated header file of .cpp
files should be included before any other includes.

Then built with:
$ gn gen out-gn
$ ninja -C out-gn x

BUG=None
TEST=see above
R=sadrul@chromium.org

Review URL: https://codereview.chromium.org/966173002

Cr-Commit-Position: refs/heads/master@{#318757}