Revert of All DCP manager tests that enroll/register are tested with all auths.

chrome/browser/chromeos/policy/device_cloud_policy_initializer.h

Index: chrome/browser/chromeos/policy/device_cloud_policy_initializer.h
diff --git a/chrome/browser/chromeos/policy/device_cloud_policy_initializer.h b/chrome/browser/chromeos/policy/device_cloud_policy_initializer.h
index ff6725c11ad66bd2b19d044f89695cf7aa87fe5a..30dfe31fc2977a8e9ceb97520dfd52703819bff2 100644
--- a/chrome/browser/chromeos/policy/device_cloud_policy_initializer.h
+++ b/chrome/browser/chromeos/policy/device_cloud_policy_initializer.h
@@ -11,7 +11,6 @@
 
 #include "base/callback_forward.h"
 #include "base/compiler_specific.h"
-#include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/policy/server_backed_state_keys_broker.h"
@@ -98,12 +97,8 @@
   void OnStoreLoaded(CloudPolicyStore* store) override;
   void OnStoreError(CloudPolicyStore* store) override;
 
-  // Allows testing code to set a signing service tailored to its needs.
-  void SetSigningServiceForTesting(
-      std::unique_ptr<policy::SigningService> signing_service);
-
  private:
-  // Signing class implementing the policy::SigningService interface to
+  // Signing class implemting the policy::SigningService interface to
   // sign data using the enrollment certificate's TPM-bound key.
   class TpmEnrollmentKeySigningService : public policy::SigningService {
    public:
@@ -153,7 +148,7 @@
   ServerBackedStateKeysBroker::Subscription state_keys_update_subscription_;
 
   // Our signing service.
-  std::unique_ptr<SigningService> signing_service_;
+  TpmEnrollmentKeySigningService signing_service_;
 
   DISALLOW_COPY_AND_ASSIGN(DeviceCloudPolicyInitializer);
 };