Remove unnecessary support for default values.

lib/html/scripts/generator.py

Index: lib/html/scripts/generator.py
diff --git a/lib/html/scripts/generator.py b/lib/html/scripts/generator.py
index a6e757808783e049b69d1badf321fd5543adcd99..5eec8873d3f9eeb4a8f51e83acc9c1ecdbce1a1e 100644
--- a/lib/html/scripts/generator.py
+++ b/lib/html/scripts/generator.py
@@ -352,7 +352,7 @@ class OperationInfo(object):
       if dart_type != 'Dynamic':
         dart_type = rename_type(dart_type)
       return TypeOrNothing(dart_type, param.type_id)
-    return self._FormatParams(self.param_infos, None, type_function)
+    return self._FormatParams(self.param_infos, type_function)
 
   def ParametersImplementationDeclaration(self, rename_type):
     """Returns a formatted string declaring the parameters for the
@@ -368,7 +368,7 @@ class OperationInfo(object):
       if dart_type != 'Dynamic':
         dart_type = rename_type(dart_type)
       return TypeOrNothing(dart_type)
-    return self._FormatParams(self.param_infos, 'null', type_function)
+    return self._FormatParams(self.param_infos, type_function)
 
   def ParametersAsArgumentList(self, parameter_count = None):
     """Returns a string of the parameter names suitable for passing the
@@ -380,13 +380,10 @@ class OperationInfo(object):
         lambda param_info: param_info.name,
         self.param_infos[:parameter_count]))
 
-  def _FormatParams(self, params, default_value, type_fn):
+  def _FormatParams(self, params, type_fn):
     def FormatParam(param):
       """Returns a parameter declaration fragment for an ParamInfo."""
-      type = type_fn(param)
-      if param.is_optional and default_value and default_value != 'null':
-        return '%s%s = %s' % (type, param.name, default_value)
-      return '%s%s' % (type, param.name)
+      return '%s%s' % (type_fn(param), param.name)
 
     required = []
     optional = []