GitLab

The tab_private.h file exposes Tab private APIs that are deprecated
so remove includes that are no longer necessary.

Bug: 620465
Change-Id: I7afca1fb2346405c06f4a7eae50041aa9891ae91
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Reviewed-on: https://chromium-review.googlesource.com/806176Reviewed-by: Elodie Banel <lod@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521335}