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This reverts commit eaeee48e.

Reason for revert: broke generate build file step on some builders. See https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8939809310924674512/+/steps/generate_build_files/0/stdout as an example:

Traceback (most recent call last):
  File "C:\b\swarming\w\ir\cache\builder\src\tools\mb\mb.py", line 63, in Main
    ret = self.args.func()
  File "C:\b\swarming\w\ir\cache\builder\src\tools\mb\mb.py", line 299, in CmdGen
    vals = self.Lookup()
  File "C:\b\swarming\w\ir\cache\builder\src\tools\mb\mb.py", line 601, in Lookup
    config = self.ConfigFromArgs()
  File "C:\b\swarming\w\ir\cache\builder\src\tools\mb\mb.py", line 683, in ConfigFromArgs
    (self.args.builder, self.args.master, self.args.config_file))
MBErr: Builder name "Win"  not found under masters[chromium] in "C:\b\swarming\w\ir\cache\builder\src\tools\mb\mb_config.pyl"
step returned non-zero exit code: 1

Original change's description:
> Rename main chromium builders
> 
> Uses the bit.ly/chromium-build-naming naming scheme.
> 
> Bug: 867725
> Change-Id: Id1d903c2a0d108c447a42919f3bfc72a917a4d18
> Reviewed-on: https://chromium-review.googlesource.com/1153616
> Reviewed-by: Dirk Pranke <dpranke@chromium.org>
> Commit-Queue: Stephen Martinis <martiniss@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#578829}

TBR=dpranke@chromium.org,martiniss@chromium.org,jbudorick@chromium.org

Change-Id: I1bc2dd5e461bdc8438a36e57a04ead43b5c0d76b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 867725
Reviewed-on: https://chromium-review.googlesource.com/1153867Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578837}