Elim unused Cellular.SIMLocked UMA stat

Bug: 643565
Change-Id: I3ad3aede53c90ba83f630626a6539daa104ef3a9
Reviewed-on: https://chromium-review.googlesource.com/747042Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512896}

chromeos/network/device_state.cc

@@ -123,16 +123,6 @@ bool DeviceState::PropertyChanged(const std::string& key,
   return false;
 }
 
-bool DeviceState::InitialPropertiesReceived(
-    const base::DictionaryValue& properties) {
-  // Update UMA stats.
-  if (sim_present_) {
-    bool locked = !sim_lock_type_.empty();
-    UMA_HISTOGRAM_BOOLEAN("Cellular.SIMLocked", locked);
-  }
-  return false;
-}
-
 void DeviceState::IPConfigPropertiesChanged(
     const std::string& ip_config_path,
     const base::DictionaryValue& properties) {

chromeos/network/device_state.h

@@ -26,8 +26,6 @@ class CHROMEOS_EXPORT DeviceState : public ManagedState {
   // ManagedState overrides
   bool PropertyChanged(const std::string& key,
                        const base::Value& value) override;
-  bool InitialPropertiesReceived(
-      const base::DictionaryValue& properties) override;
 
   void IPConfigPropertiesChanged(const std::string& ip_config_path,
                                  const base::DictionaryValue& properties);