middleware: Stop using X_REAL_IP.

The comment was wrong, in that REMOTE_ADDR is where the real external
IP was; X_REAL_IP was the loadbalancer's IP.

zerver/middleware.py

@@ -276,9 +276,6 @@ class LogRequests(MiddlewareMixin):
             # intends to block, so we stop here to avoid unnecessary work.
             return response
 
-        # The reverse proxy might have sent us the real external IP
-        remote_ip = request.META.get('HTTP_X_REAL_IP')
-        if remote_ip is None:
         remote_ip = request.META['REMOTE_ADDR']
 
         # Get the requestor's identifier and client, if available.

zerver/views/report.py

@@ -113,8 +113,6 @@ def report_error(request: HttpRequest, user_profile: UserProfile, message: str=R
         version = None
 
     # Get the IP address of the request
-    remote_ip = request.META.get('HTTP_X_REAL_IP')
-    if remote_ip is None:
     remote_ip = request.META['REMOTE_ADDR']
 
     # For the privacy of our users, we remove any actual text content