Revert of [package.proto] add canonical_base_url field.

recipe_engine/result_pb2.py

 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: result.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 152 matching lines @@
 _TIMEOUT = _descriptor.Descriptor(
   name='Timeout',
   full_name='Timeout',
   filename=None,
   file=DESCRIPTOR,
   containing_type=None,
   fields=[
     _descriptor.FieldDescriptor(
       name='timeout_s', full_name='Timeout.timeout_s', index=0,
       number=1, type=2, cpp_type=6, 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),
   ],
   extensions=[
   ],
   nested_types=[],
   enum_types=[
   ],
   options=None,
@@ skipping 135 matching lines @@
 
 StepFailure = _reflection.GeneratedProtocolMessageType('StepFailure', (_message.Message,), dict(
   DESCRIPTOR = _STEPFAILURE,
   __module__ = 'result_pb2'
   # @@protoc_insertion_point(class_scope:StepFailure)
   ))
 _sym_db.RegisterMessage(StepFailure)
 
 
 # @@protoc_insertion_point(module_scope)