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This prevents GCC from spamming the build with warnings such as

    ../../base/message_loop/message_pump_for_io.h:39:22: warning: missing terminating ' character
     #error Platform doesn't define MessagePumpForIO

Change-Id: Ice62f39141a613c2ab4a56c031826c43292f287f
Reviewed-on: https://chromium-review.googlesource.com/997632
Commit-Queue: Gabriel Charette <gab@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548424}