Make //third_party/zlib a component

//third_party/zlib currently gets duplicated in 418 DSOs when building 'all'.
This CL makes zlib a component so that component builds are a bit
smaller/faster.

Also rename zlib/names.h to zlib/chromeconf.h and remove it from patch files.

BUG=941663
R=thakis

Change-Id: I520d7ed30d0cfc322ebf1b9fb31bfbf5469f0209
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1545510


Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#648854}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: d7ee2f99fc936f2162a65b9bf087af94646248e8