Revert “new updater” changes.

The “new updater” project was half-completed when it was abandoned
in favor of a different approach. The different approach has been
serving us well, so remove all the code for the “new updater”
project.

This effectively reverts:
21f3fb21876ade359bf8e4be11c8130a96500f85
4a634b732f8b01031b5135fd92d16f036e11ba9a
c0ec38a164e838128ebb00215d772166d90d20e8
ce903eec2c42ae9c0011467517b52b0faa57fb90
22f97bafad183f3bcf421fe92ba031af9f84eb72
35b27074c9a1b3b4424fb3ea039f46d51c52bd46
1f478d5afed6c730023f9e59d9cf74d1ff4d1a56
4a3246682168b0342bc293f327a663182e79ee4c
f316ef44992122636cacb59c97d99575b68c108b
8bcf1fdb0dfc2a870dc093f228b3b208d1184e66
bc95a5bb05ce462fe6f5c03bf831caf70b1c8fc5
753cb9dffd9887d9ce84ef3d3f546f10f91cf409

Bug: 960814, 1025805
Change-Id: I9f3e2b2d75d42f2ad49666dce4e0316f8a934e51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1991705
Reviewed-by: Mark Mentovai <[email protected]>
Reviewed-by: Ilya Sherman <[email protected]>
Commit-Queue: Avi Drissman <[email protected]>
Cr-Commit-Position: refs/heads/master@{#729901}
26 files changed