[build] Used data deps from GN

NOTREECHECKS=true

Bug: chromium:669910
Change-Id: I16cfbb6bd6aa8eb4bad3289dfe43c1cd33c42f92
Reviewed-on: https://chromium-review.googlesource.com/980336
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52226}

tools/mb/mb.py

@@ -233,10 +233,6 @@ class MetaBuildWrapper(object):
 
     self.args = parser.parse_args(argv)
 
-    # TODO(machenbach): This prepares passing swarming targets to isolate on the
-    # infra side.
-    self.args.swarming_targets_file = None
-
   def DumpInputFiles(self):
 
     def DumpContentsOfFilePassedTo(arg_name, path):

tools/mb/mb_unittest.py

@@ -360,8 +360,6 @@ class UnitTest(unittest.TestCase):
     mbw.Call = lambda cmd, env=None, buffer_output=True: (1, '', '')
     self.check(['gen', '-c', 'debug_goma', '//out/Default'], mbw=mbw, ret=1)
 
-  # TODO(machenbach): Comment back in after swarming file parameter is used.
-  """
   def test_gen_swarming(self):
     files = {
       '/tmp/swarming_targets': 'base_unittests\n',
@@ -549,7 +547,6 @@ class UnitTest(unittest.TestCase):
                 'base_unittests'], mbw=mbw, ret=0)
     self.check(['run', '-s', '-c', 'debug_goma', '-d', 'os', 'Win7',
                 '//out/Default', 'base_unittests'], mbw=mbw, ret=0)
-  """  # pylint: disable=pointless-string-statement
 
   def test_lookup(self):
     self.check(['lookup', '-c', 'debug_goma'], ret=0)