Revert of [package.proto] add canonical_base_url field.

recipe_engine/arguments_pb2.py

 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: arguments.proto
 
 import sys
 _b=sys.version_info[0]<3 and (lambda x:x) or (lambda x:x.encode('latin1'))
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import message as _message
 from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
 from google.protobuf import descriptor_pb2
@@ skipping 39 matching lines @@
     _descriptor.FieldDescriptor(
       name='uint', full_name='recipe_engine.Arguments.Property.uint', index=2,
       number=3, type=4, cpp_type=4, label=1,
       has_default_value=False, default_value=0,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
       name='d', full_name='recipe_engine.Arguments.Property.d', index=3,
       number=4, type=1, cpp_type=5, label=1,
-      has_default_value=False, default_value=0,
+      has_default_value=False, default_value=float(0),
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
     _descriptor.FieldDescriptor(
       name='b', full_name='recipe_engine.Arguments.Property.b', index=4,
       number=5, type=8, cpp_type=7, label=1,
       has_default_value=False, default_value=False,
       message_type=None, enum_type=None, containing_type=None,
       is_extension=False, extension_scope=None,
       options=None),
@@ skipping 405 matching lines @@
 _sym_db.RegisterMessage(Arguments.PropertyMap)
 _sym_db.RegisterMessage(Arguments.PropertyMap.PropertyEntry)
 _sym_db.RegisterMessage(Arguments.AnnotationFlags)
 _sym_db.RegisterMessage(Arguments.LogDogFlags)
 _sym_db.RegisterMessage(Arguments.EngineFlags)
 
 
 _ARGUMENTS_PROPERTYMAP_PROPERTYENTRY.has_options = True
 _ARGUMENTS_PROPERTYMAP_PROPERTYENTRY._options = _descriptor._ParseOptions(descriptor_pb2.MessageOptions(), _b('8\001'))
 # @@protoc_insertion_point(module_scope)