Clear g_created_policy_service at BrowserPolicyConnector::Shutdown.

This allows other tests in the same suite to call SetPolicyProviderForTesting.

TBR=pastarmovj@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/303393003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274148 0039d316-1c4b-4281-b951-d872f2087c98

components/policy/core/browser/browser_policy_connector.cc

@@ -116,6 +116,7 @@ void BrowserPolicyConnector::Shutdown() {
   // Drop g_testing_provider so that tests executed with --single_process can
   // call SetPolicyProviderForTesting() again. It is still owned by the test.
   g_testing_provider = NULL;
+  g_created_policy_service = false;
   device_management_service_.reset();
 }