Make `git cl try` to the same as hitting cq (except for presubmit).

PRESUBMIT.py used to contain a handwritten list of bots to trigger on
`git cl try`. It was always out of sync with what the cq did.
https://codereview.chromium.org/823823002 awesomely made `git cl try` do
the same thing as the commit queue, but it kept a few special-case rules around.

It's better to not have these special cases: Once the developer hits cq, all
the "intelligently" skipped bots need to be run anyways.  More importantly,
there should be only one system to decide what to run and it should be
identical for cq and `git cl try`.  Currently, we think this system is the
`analyze` step, and it does a decent job of that already.

BUG=none (but made possible by 443613)

Review URL: https://codereview.chromium.org/921323003

Cr-Commit-Position: refs/heads/master@{#317597}

PRESUBMIT.py

@@ -1744,29 +1744,6 @@ def GetPreferredTryMasters(project, change):
   import re
   files = change.LocalPaths()
 
-  if not files or all(re.search(r'[\\\/]OWNERS$', f) for f in files):
-    return {}
-
-  if all(re.search(r'\.(m|mm)$|(^|[\\\/_])mac[\\\/_.]', f) for f in files):
-    return GetDefaultTryConfigs([
-        'mac_chromium_compile_dbg_ng',
-        'mac_chromium_rel_ng',
-    ])
-  if all(re.search('(^|[/_])win[/_.]', f) for f in files):
-    return GetDefaultTryConfigs([
-        'win8_chromium_rel',
-        'win_chromium_rel_ng',
-        'win_chromium_x64_rel_ng',
-    ])
-  if all(re.search(r'(^|[\\\/_])android[\\\/_.]', f) and
-         not re.search(r'(^|[\\\/_])devtools[\\\/_.]', f) for f in files):
-    return GetDefaultTryConfigs([
-        'android_aosp',
-        'android_rel_tests_recipe',
-    ])
-  if all(re.search(r'[\\\/_]ios[\\\/_.]', f) for f in files):
-    return GetDefaultTryConfigs(['ios_rel_device', 'ios_dbg_simulator'])
-
   import os
   import json
   with open(os.path.join(
@@ -1787,10 +1764,4 @@ def GetPreferredTryMasters(project, change):
         if 'presubmit' in builder:
           builders[master].pop(builder)
 
-  # Match things like path/aura/file.cc and path/file_aura.cc.
-  # Same for chromeos.
-  if any(re.search(r'[\\\/_](aura|chromeos)', f) for f in files):
-    tryserver_linux = builders.setdefault('tryserver.chromium.linux', {})
-    tryserver_linux['linux_chromium_chromeos_asan_rel_ng'] = ['defaulttests']
-
   return builders

PRESUBMIT_test.py

@@ -375,14 +375,6 @@ class BadExtensionsTest(unittest.TestCase):
     results = PRESUBMIT._CheckPatchFiles(mock_input_api, MockOutputApi())
     self.assertEqual(0, len(results))
 
-  def testOnlyOwnersFiles(self):
-    mock_change = MockChange([
-      'some/path/OWNERS',
-      'A\Windows\Path\OWNERS',
-    ])
-    results = PRESUBMIT.GetPreferredTryMasters(None, mock_change)
-    self.assertEqual({}, results)
-
 
 class CheckSingletonInHeadersTest(unittest.TestCase):
   def testSingletonInArbitraryHeader(self):