privetd: Remove empty device name checks

Server allows to have empty name. Buffet and privet also has no
requirement to have it not empty.

BUG=brillo:989
CQ-DEPEND=CL:274924
TEST=`FEATURES=test emerge-gizmo privetd buffet`

Change-Id: I02e141149d6eaf36a6c92676e68ab02b8287c724
Reviewed-on: https://chromium-review.googlesource.com/274883
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>

buffet/buffet_config.cc

diff --git a/buffet/buffet_config.cc b/buffet/buffet_config.cc
index bf8891e..dc3ae97 100644
--- a/buffet/buffet_config.cc
+++ b/buffet/buffet_config.cc
@@ -128,6 +128,8 @@
   if (store.GetString(config_keys::kBackupPollingPeriodMs, &polling_period_str))
     CHECK(base::StringToUint64(polling_period_str, &backup_polling_period_ms_));
 
+  // Empty name set by user or server is allowed, still we expect some
+  // meaningfull config value.
   store.GetString(config_keys::kName, &name_);
   CHECK(!name_.empty());
 
@@ -228,15 +230,6 @@
   Commit();
 }
 
-bool BuffetConfig::Transaction::set_name(const std::string& name) {
-  if (name.empty()) {
-    LOG(ERROR) << "Invalid name: " << name;
-    return false;
-  }
-  config_->name_ = name;
-  return true;
-}
-
 bool BuffetConfig::Transaction::set_local_anonymous_access_role(
     const std::string& role) {
   if (!IsValidAccessRole(role)) {

buffet/buffet_config.h

diff --git a/buffet/buffet_config.h b/buffet/buffet_config.h
index d755f08..43202a6 100644
--- a/buffet/buffet_config.h
+++ b/buffet/buffet_config.h
@@ -56,7 +56,7 @@
     void set_service_url(const std::string& url) {
       config_->service_url_ = url;
     }
-    bool set_name(const std::string& name);
+    void set_name(const std::string& name) { config_->name_ = name; }
     void set_description(const std::string& description) {
       config_->description_ = description;
     }

buffet/device_registration_info.cc

diff --git a/buffet/device_registration_info.cc b/buffet/device_registration_info.cc
index 3dd5864..bd02b23 100644
--- a/buffet/device_registration_info.cc
+++ b/buffet/device_registration_info.cc
@@ -669,11 +669,7 @@
                                               const std::string& location,
                                               chromeos::ErrorPtr* error) {
   BuffetConfig::Transaction change{config_.get()};
-  if (!change.set_name(name)) {
-    chromeos::Error::AddTo(error, FROM_HERE, kErrorDomainBuffet,
-                           "invalid_parameter", "Empty device name");
-    return false;
-  }
+  change.set_name(name);
   change.set_description(description);
   change.set_location(location);
   change.Commit();