Fix a few strong mode errors in dart:html

tools/dom/scripts/htmldartgenerator.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for the system to generate
 dart:html APIs from the IDL database."""
 
 import emitter
 from generator import AnalyzeOperation, ConstantOutputOrder, \
@@ skipping 569 matching lines @@
             CTOR=constructor_info._ConstructorFullName(self._DartType),
             PARAMS=constructor_info.ParametersAsDeclaration(InputType),
             FACTORY=factory_name,
             METADATA=metadata,
             CTOR_FACTORY_NAME=factory_constructor_name,
             FACTORY_PARAMS=factory_parameters)
       else:
         inits = self._members_emitter.Emit(
             '\n  $(METADATA)'
             'factory $CONSTRUCTOR($PARAMS) {\n'
-            '    var e = $FACTORY.$CTOR_FACTORY_NAME($FACTORY_PARAMS);\n'
+            '    $CONSTRUCTOR e = $FACTORY.$CTOR_FACTORY_NAME($FACTORY_PARAMS);\n'
             '$!INITS'
             '    return e;\n'
             '  }\n',
             CONSTRUCTOR=constructor_info._ConstructorFullName(self._DartType),
             METADATA=metadata,
             FACTORY=factory_name,
             CTOR_FACTORY_NAME=factory_constructor_name,
             PARAMS=constructor_info.ParametersAsDeclaration(InputType),
             FACTORY_PARAMS=factory_parameters)
 
@@ skipping 287 matching lines @@
   def _InputType(self, type_name, info):
     conversion = self._InputConversion(type_name, info.declared_name)
     if conversion:
       return conversion.input_type
     else:
       # If typedef it's a union return dynamic.
       if self._database.HasTypeDef(type_name):
         return 'dynamic'
       else:
         return self._NarrowInputType(type_name) if type_name else 'dynamic'