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

components/policy/core/common/cloud/mock_signing_service.h

Index: components/policy/core/common/cloud/mock_signing_service.h
diff --git a/components/policy/core/common/cloud/mock_signing_service.h b/components/policy/core/common/cloud/mock_signing_service.h
index d8024f3a1c7a4d8e2902d9e20639935a774253b0..beb3f092e33bffe9027036da052b0c3c8af732ba 100644
--- a/components/policy/core/common/cloud/mock_signing_service.h
+++ b/components/policy/core/common/cloud/mock_signing_service.h
@@ -17,17 +17,19 @@
   FakeSigningService();
   virtual ~FakeSigningService();
 
+  void SignRegistrationData(
+      const enterprise_management::CertificateBasedDeviceRegistrationData*
+          registration_data,
+      enterprise_management::SignedData* signed_data);
+
   void SignData(const std::string& data, const SigningCallback& callback)
       override;
 
-  // Useful for test setups without having to deal with callbacks.
-  void SignDataSynchronously(const std::string& data,
-      enterprise_management::SignedData* signed_data);
+  void set_success(bool success);
+ private:
+  void DoSignData(const std::string& data,
+                         enterprise_management::SignedData* signed_data);
 
-  // Determine whether SignData will appear successful or not.
-  void set_success(bool success);
-
- private:
   bool success_ = true;
 };