Don't import cookie_manager.mojom in network_service.mojom.

It is not used there. Then do IWYU in browsing_data_filter_builder.h to
fix the build.

Change-Id: Icc64d0cb450819caa7ee5aac5d1c5fbe3a11a67d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3369092


Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/main@{#958200}