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Screenshot: https://screenshot.googleplex.com/7sot2pkVRoKn5ci.png

- Adds a new system tray icon
- Adds icon as a button to system tray
- No test where added because network_section_header.cc does not
  currently have a test. Test will be added in a subsequent CL

Bug: 1163556
Change-Id: Ia965ec395b83f72b20350851a730f76a392f4669
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2622658Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Commit-Queue: Nnamdi Theodore Johnson-kanu <tjohnsonkanu@google.com>
Cr-Commit-Position: refs/heads/master@{#842879}