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Changes in this cl:
 * Split SectionHeaderRowView and subclasses to a new file.
 * Remove the concept of a "subtitle" in a section header.
 * MobileHeaderRowView no longer subscribes to network updates directly,
   toggle status is triggered by NetworkListView.
 * Display mobile status messages with similar logic as we display WiFi
   status messages.
 * Initializes section headers on NetworkListView constructor to
   simplify logic.
 * Removes unused headers.

Current UI spec no longer has the concept of a "subtitle". It was
confusing that mobile status messages were being shown as a
"subtitle", while WiFi status messages are a label in NetworkListView.

Mobile toggle state and status message logic is complex. Decided to make
NetworkListView call MobileHeaderView to get the mobile status message.
This way we can re-use existing subtitle selection logic.

Change-Id: I46c99d01100db39cc4541910d3b19f670cd1fc50
Reviewed-on: https://chromium-review.googlesource.com/c/1371902
Commit-Queue: Tony De Luna <tonydeluna@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615762}