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This CL removes macro usage from /ios/chrome/browser/tabs.

This CL was uploaded by git cl split.

R=rohitrao@chromium.org

Bug: 589840
Change-Id: I6b33f5491423d55455e912ee01adec2c73686122
Reviewed-on: https://chromium-review.googlesource.com/c/1351079Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612311}