Migrate desktop Linux to histogram_macros.h include.

Updates ifdefs in histogram.h to prevent this from regressing
for Linux desktop. The ifdef will be updated incrementally as
each platform becomes fully migrated.

BUG=416479
TBR=gbillock@chromium.org,tommi@chromium.org,stevenjb@chromium.org,rockot@chromium.org,sadrul@chromium.org

Review-Url: https://codereview.chromium.org/2639313002
Cr-Commit-Position: refs/heads/master@{#444736}


CrOS-Libchrome-Original-Commit: 12d9cdafee5f8ed2fa72868ec75c34eec0216000
4 files changed
tree: 2d2bcea41cede3321f384c67501495ea39efa743
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/