Remove gen/blink/core from build files since all includes have been qualified.

Source/bindings/scripts/v8_attributes.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 348 matching lines @@
 
     base_idl_type = attribute.idl_type.base_type
     if base_idl_type in CONTENT_ATTRIBUTE_SETTER_NAMES:
         return CONTENT_ATTRIBUTE_SETTER_NAMES[base_idl_type]
     return 'setAttribute'
 
 
 def scoped_content_attribute_name(interface, attribute):
     content_attribute_name = attribute.extended_attributes['Reflect'] or attribute.name.lower()
     namespace = 'SVGNames' if interface.name.startswith('SVG') else 'HTMLNames'
-    includes.add('%s.h' % namespace)
+    includes.add('core/%s.h' % namespace)
     return '%s::%sAttr' % (namespace, content_attribute_name)
 
 
 ################################################################################
 # Attribute configuration
 ################################################################################
 
 # [Replaceable]
 def setter_callback_name(interface, attribute):
     cpp_class_name = cpp_name(interface)
@@ skipping 47 matching lines @@
     lambda self: strip_suffix(self.base_type, 'Constructor'))
 
 
 def is_constructor_attribute(attribute):
     # FIXME: replace this with [ConstructorAttribute] extended attribute
     return attribute.idl_type.base_type.endswith('Constructor')
 
 
 def generate_constructor_getter(interface, attribute, contents):
     contents['needs_constructor_getter_callback'] = contents['measure_as'] or contents['deprecate_as']