device_management_service: Transform ifs to switch-case

Transform the sequence of ifs to set authentication headers to a
switch-case over the token type.

Bug: none
Change-Id: Id636342873c77f76cf6adb8abe7f5668c448b2b6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567219
Commit-Queue: Pavol Marko <pmarko@chromium.org>
Reviewed-by: Michael Ershov <miersh@google.com>
Cr-Commit-Position: refs/heads/master@{#835619}

components/policy/core/common/cloud/device_management_service.cc

@@ -299,22 +299,29 @@ JobConfigurationBase::GetResourceRequest(bool bypass_proxy, int last_error) {
   rr->trusted_params->disable_secure_dns = true;
 
   // If auth data is specified, use it to build the request.
-  if (auth_data_.has_gaia_token()) {
+  switch (auth_data_.token_type()) {
+    case DMAuthTokenType::kNoAuth:
+      break;
+    case DMAuthTokenType::kGaia:
       rr->headers.SetHeader(
           dm_protocol::kAuthHeader,
           std::string(dm_protocol::kServiceTokenAuthHeaderPrefix) +
               auth_data_.gaia_token());
-  }
-  if (auth_data_.has_dm_token()) {
+      break;
+    case DMAuthTokenType::kDm:
       rr->headers.SetHeader(dm_protocol::kAuthHeader,
                             std::string(dm_protocol::kDMTokenAuthHeaderPrefix) +
                                 auth_data_.dm_token());
-  }
-  if (auth_data_.has_enrollment_token()) {
+      break;
+    case DMAuthTokenType::kEnrollment:
       rr->headers.SetHeader(
           dm_protocol::kAuthHeader,
           std::string(dm_protocol::kEnrollmentTokenAuthHeaderPrefix) +
               auth_data_.enrollment_token());
+      break;
+    case DMAuthTokenType::kOauth:
+      // OAuth token is transferred as a HTTP query parameter.
+      break;
   }
 
   return rr;