Revert of Send GCM id to DMServer

components/policy/proto/device_management_backend.proto

Index: components/policy/proto/device_management_backend.proto
diff --git a/components/policy/proto/device_management_backend.proto b/components/policy/proto/device_management_backend.proto
index cd5e9b08bce5f140ab35da336fffa876f8cff316..7756f2390ab6661fc6272cfd0cb752976c0d9000 100644
--- a/components/policy/proto/device_management_backend.proto
+++ b/components/policy/proto/device_management_backend.proto
@@ -1021,15 +1021,6 @@
   optional ResultType result = 1;
 }
 
-// Sent by the client to server to update the mapping from GCM id to device_id
-// on the server side.
-message GcmIdUpdateRequest {
-  optional string gcm_id = 1;
-}
-
-// Response for GcmIdUpdateRequest, an empty message for now.
-message GcmIdUpdateResponse {}
-
 // Request from the DMAgent on the device to the DMServer.  This is
 // container for all requests from device to server.  The overall HTTP
 // request MUST be in the following format:
@@ -1052,7 +1043,6 @@
 //     * remote_commands
 //     * attribute_update_permission
 //     * attribute_update
-//     * gcm_id_update
 //
 //   * devicetype: MUST BE "1" for Android or "2" for Chrome OS.
 //   * apptype: MUST BE Android or Chrome.
@@ -1062,8 +1052,7 @@
 //   * For register and ping requests
 //     Authorization: GoogleLogin auth=<auth cookie for Mobile Sync>
 //
-//   * For unregister, policy, status, cert_upload, remote commands requests,
-//     and gcm id update requests
+//   * For unregister, policy, status, cert_upload and remote commands requests
 //      Authorization: GoogleDMToken token=<dm token from register>
 //
 //   * The Authorization header isn't used for enterprise_check
@@ -1086,7 +1075,6 @@
 //   remote_commands: remote_command_request
 //   attribute_update_permission: device_attribute_update_permission_request
 //   attribute_update: device_attribute_update_request
-//   gcm_id_update: gcm_id_update_request
 //
 message DeviceManagementRequest {
   // Register request.
@@ -1133,9 +1121,6 @@
   // Update device attribute.
   optional DeviceAttributeUpdateRequest device_attribute_update_request
       = 15;
-
-  // Update the GCM id to device_id mapping.
-  optional GcmIdUpdateRequest gcm_id_update_request = 16;
 }
 
 // Response from server to device.
@@ -1200,7 +1185,4 @@
 
   // Response to update device attribute.
   optional DeviceAttributeUpdateResponse device_attribute_update_response = 16;
-
-  // Response to GCM id update request.
-  optional GcmIdUpdateResponse gcm_id_update_response = 17;
-}
+}