Revert of Adds support for running unittests using XCTest on iOS.

base/test/test_support_ios.mm

Index: base/test/test_support_ios.mm
diff --git a/base/test/test_support_ios.mm b/base/test/test_support_ios.mm
index b9bee484cb15c323eb413890f2f59d498caae45c..2509fa0e7307b078d7df913351fea1ce1995faf2 100644
--- a/base/test/test_support_ios.mm
+++ b/base/test/test_support_ios.mm
@@ -1,8 +1,6 @@
 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
-#include "base/test/test_support_ios.h"
 
 #import <UIKit/UIKit.h>
 
@@ -156,12 +154,6 @@
 
 - (void)runTests {
   int exitStatus = g_test_suite->Run();
-
-  if (base::IsRunningWithXCTest()) {
-    // Do not kill the app when running in XCTest mode.  XCTest will shut down
-    // the app itself.
-    return;
-  }
 
   if ([self shouldRedirectOutputToFile])
     [self writeOutputToNSLog];
@@ -225,10 +217,4 @@
   }
 }
 
-bool IsRunningWithXCTest() {
-  // Under Xcode 7.3 and 8.0, the "XCTestConfigurationFilePath" environment
-  // variable is set when running XCTests.
-  return getenv("XCTestConfigurationFilePath") != nullptr;
-}
-
 }  // namespace base