factory: Fix arguments-differ pylint error

Make the argument names the same with the overridden method's if those
names are suitable to the context of the function body.

BUG=chromium:999876
TEST=make lint

Change-Id: I5bde2554e9e047a3514783d96dfb9722dc49f745
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/factory/+/1991294
Commit-Queue: Yilin Yang (kerker) <kerker@chromium.org>
Tested-by: Yilin Yang (kerker) <kerker@chromium.org>
Auto-Submit: Yilin Yang (kerker) <kerker@chromium.org>
Reviewed-by: Yong Hong <yhong@chromium.org>
diff --git a/py/tools/ovl.py b/py/tools/ovl.py
index b0e8335..8bc40a1 100755
--- a/py/tools/ovl.py
+++ b/py/tools/ovl.py
@@ -562,9 +562,9 @@
     termios.tcsetattr(self._stdin_fd, termios.TCSANOW, self._old_termios)
     print('Connection to %s closed.' % self._mid)
 
-  def received_message(self, msg):
-    if msg.is_binary:
-      sys.stdout.write(msg.data)
+  def received_message(self, message):
+    if message.is_binary:
+      sys.stdout.write(message.data)
       sys.stdout.flush()
 
 
@@ -601,9 +601,9 @@
   def closed(self, code, reason=None):
     pass
 
-  def received_message(self, msg):
-    if msg.is_binary:
-      self.output.write(msg.data)
+  def received_message(self, message):
+    if message.is_binary:
+      self.output.write(message.data)
       self.output.flush()
 
 
@@ -644,9 +644,9 @@
     self._stop.set()
     sys.exit(0)
 
-  def received_message(self, msg):
-    if msg.is_binary:
-      self._sock.send(msg.data)
+  def received_message(self, message):
+    if message.is_binary:
+      self._sock.send(message.data)
 
 
 def Arg(*args, **kwargs):