Fix pylint unused-* warnings in webkitpy/tool.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/command.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/command.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/command.py b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/command.py
index e570cbb8c62805132b10bd8b98ef1f0c602f3563..4e1a64141a9196e3d6eb24affae90c22c8f875ed 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/command.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/command.py
@@ -147,7 +147,7 @@ class HelpPrintingOptionParser(optparse.OptionParser):
 
     # We override format_epilog to avoid the default formatting which would paragraph-wrap the epilog
     # and also to allow us to compute the epilog lazily instead of in the constructor (allowing it to be context sensitive).
-    def format_epilog(self, epilog):
+    def format_epilog(self, epilog):  # pylint: disable=unused-argument
         if self.epilog_method:
             return "\n%s\n" % self.epilog_method()
         return ""