[py] make w3c execute_script commands unique

Author: lmtierney

py/selenium/webdriver/remote/command.py

@@ -78,8 +78,8 @@ class Command(object):
     GET_PAGE_SOURCE = "getPageSource"
     GET_TITLE = "getTitle"
     EXECUTE_SCRIPT = "executeScript"
-    W3C_EXECUTE_SCRIPT = "executeScript"
-    W3C_EXECUTE_SCRIPT_ASYNC = "executeScriptAsync"
+    W3C_EXECUTE_SCRIPT = "w3cExecuteScript"
+    W3C_EXECUTE_SCRIPT_ASYNC = "w3cExecuteScriptAsync"
     GET_ELEMENT_TEXT = "getElementText"
     GET_ELEMENT_VALUE = "getElementValue"
     GET_ELEMENT_TAG_NAME = "getElementTagName"