Elim shill::kCarrierProperty reference

This property is unused in Shill and Chrome.

Bug=b:173635024

Change-Id: Ie28c18a959ec9a279794ecf5c30d8f856aeea89f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2552891Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829879}

chromeos/dbus/hermes/fake_hermes_profile_client.cc

@@ -154,12 +154,6 @@ void FakeHermesProfileClient::UpdateCellularDevice(
 
   // Update the cellular device properties so that they match the carrier
   // profile that was just enabled.
-  device_test->SetDeviceProperty(
-      kCellularDevicePath, shill::kCarrierProperty,
-      base::Value(properties->service_provider().value()), true);
-  device_test->SetDeviceProperty(
-      kCellularDevicePath, shill::kCarrierProperty,
-      base::Value(properties->service_provider().value()), true);
   base::DictionaryValue home_provider;
   home_provider.SetKey(shill::kNameProperty,
                        base::Value(properties->service_provider().value()));

chromeos/network/onc/onc_signature.cc

@@ -287,7 +287,6 @@ const OncFieldSignature cellular_fields[] = {
     {::onc::kRecommended, &kRecommendedSignature},
     {::onc::cellular::kAPN, &kCellularApnSignature},
     {::onc::cellular::kAPNList, &kCellularApnListSignature},
-    {::onc::cellular::kCarrier, &kStringSignature},
     {::onc::cellular::kAutoConnect, &kBoolSignature},
     {NULL}};
 

components/onc/docs/onc_spec.md

@@ -1372,10 +1372,6 @@ ONC configuration of of **Cellular** networks is not yet supported.
     * (optional) - **boolean**
     * Whether cellular data connections are allowed when the device is roaming.
 
-* **Carrier**
-    * (optional, read-only) - **string**
-    * The name of the carrier for which the device is configured.
-
 * **ESN**
     * (optional, read-only) - **string**
     * The Electronic Serial Number of the cellular modem.

components/onc/onc_constants.cc

@@ -106,7 +106,6 @@ const char kActivationType[] = "ActivationType";
 const char kAllowRoaming[] = "AllowRoaming";
 const char kAPN[] = "APN";
 const char kAPNList[] = "APNList";
-const char kCarrier[] = "Carrier";
 const char kESN[] = "ESN";
 const char kFamily[] = "Family";
 const char kFirmwareRevision[] = "FirmwareRevision";