Note: Debug symbol arg update is due to:
warning: The GN arg 'remove_webcore_debug_symbols' is deprecated and
warning: will be removed April 15, 2019. Please change your args.gn
warning: to use 'blink_symbol_level = 0'. https://crbug.com/943869
Change-Id: I97dd3552c9f8cbcee8dc824f0546f6485bc1db0b