Remove the Singleton<T> presubmit check from presubmit_canned_checks.py

tests/presubmit_unittest.py

Index: tests/presubmit_unittest.py
diff --git a/tests/presubmit_unittest.py b/tests/presubmit_unittest.py
index e46457e0acb1f0f63278f423a1d6f1e7eaef98ab..1cb01191deaf3d18af5b1f0ba85fee2ceb5591bc 100755
--- a/tests/presubmit_unittest.py
+++ b/tests/presubmit_unittest.py
@@ -1881,7 +1881,6 @@ class CannedChecksUnittest(PresubmitTestsBase):
       'CheckPatchFormatted',
       'CheckGNFormatted',
       'CheckRietveldTryJobExecution',
-      'CheckSingletonInHeaders',
       'CheckSvnModifiedDirectories',
       'CheckSvnForCommonMimeTypes', 'CheckSvnProperty',
       'RunPythonUnitTests', 'RunPylint',
@@ -2087,41 +2086,6 @@ class CannedChecksUnittest(PresubmitTestsBase):
         'Foo', None, 'Foo ', None,
         presubmit.OutputApi.PresubmitPromptWarning)
 
-  def testCheckSingletonInHeaders(self):
-    change1 = presubmit.Change(
-        'foo1', 'foo1\n', self.fake_root_dir, None, 0, 0, None)
-    input_api1 = self.MockInputApi(change1, False)
-    affected_file1 = self.mox.CreateMock(presubmit.SvnAffectedFile)
-    affected_file2 = self.mox.CreateMock(presubmit.SvnAffectedFile)
-    input_api1.AffectedSourceFiles(None).AndReturn(
-        [affected_file1, affected_file2])
-    affected_file1.LocalPath().AndReturn('foo.h')
-    input_api1.ReadFile(affected_file1).AndReturn(
-        '// Comment mentioning Singleton<Foo>.\n' +
-        'friend class Singleton<Foo>;')
-    for _ in range(4):
-      affected_file2.LocalPath().AndReturn('foo.cc')
-
-    change2 = presubmit.Change(
-        'foo2', 'foo2\n', self.fake_root_dir, None, 0, 0, None)
-    input_api2 = self.MockInputApi(change2, False)
-
-    affected_file3 = self.mox.CreateMock(presubmit.SvnAffectedFile)
-    input_api2.AffectedSourceFiles(None).AndReturn([affected_file3])
-    affected_file3.LocalPath().AndReturn('foo.h')
-    input_api2.ReadFile(affected_file3).AndReturn(
-        'Foo* foo = Singleton<Foo>::get();')
-
-    self.mox.ReplayAll()
-
-    results1 = presubmit_canned_checks.CheckSingletonInHeaders(
-        input_api1, presubmit.OutputApi)
-    self.assertEquals(results1, [])
-    results2 = presubmit_canned_checks.CheckSingletonInHeaders(
-        input_api2, presubmit.OutputApi)
-    self.assertEquals(len(results2), 1)
-    self.assertEquals(results2[0].__class__, presubmit.OutputApi.PresubmitError)
-
   def testCheckChangeHasOnlyOneEol(self):
     self.ReadFileTest(presubmit_canned_checks.CheckChangeHasOnlyOneEol,
                       "Hey!\nHo!\n", "Hey!\nHo!\n\n",