Buck: Omit default values to gwt_binary() rule

style = 'OBF' and optimze = 9 are default values in gwt_binary() rule
definition and do not need to be passed.

Change-Id: Ic09dc032461ede6e236a267f2a32efbe161dd69c

gerrit-gwtui/BUCK

@@ -28,8 +28,6 @@ genrule(
 gwt_binary(
   name = 'ui_opt',
   modules = [MODULE],
-  style = 'OBF',
-  optimize = 9,
   module_deps = [':ui_module'],
   deps = DEPS + ['//lib/gwt:dev', ':ui_dbg'],
   local_workers = cpu_count(),

tools/default.defs

@@ -126,8 +126,6 @@ def gerrit_plugin(
     gwt_binary(
       name = name + '__gwt_application',
       modules = [gwt_module],
-      style = 'OBF',
-      optimize = 9,
       deps = [':%s__plugin' % name] + gwt_deps,
       local_workers = cpu_count(),
       strict = True,