Added support for signed policy blobs on desktop.

chrome/browser/chromeos/settings/session_manager_operation.cc

Index: chrome/browser/chromeos/settings/session_manager_operation.cc
diff --git a/chrome/browser/chromeos/settings/session_manager_operation.cc b/chrome/browser/chromeos/settings/session_manager_operation.cc
index e075a33ce9e0d85888ba8d567628c0f110b4a51e..d7f994c83f80f52730311eb322fb77ed8f20f761 100644
--- a/chrome/browser/chromeos/settings/session_manager_operation.cc
+++ b/chrome/browser/chromeos/settings/session_manager_operation.cc
@@ -182,7 +182,10 @@ void SessionManagerOperation::ValidateDeviceSettings(
       policy::CloudPolicyValidatorBase::DM_TOKEN_NOT_REQUIRED);
   validator->ValidatePolicyType(policy::dm_protocol::kChromeDevicePolicyType);
   validator->ValidatePayload();
-  validator->ValidateSignature(*owner_key_->public_key(), false);
+  validator->ValidateSignature(owner_key_->public_key_as_string(),
+                               policy::GetPolicyVerificationKey(),
+                               std::string(),
+                               false);
   validator->StartValidation(
       base::Bind(&SessionManagerOperation::ReportValidatorStatus,
                  weak_factory_.GetWeakPtr()));