Fix lint errors to enable stricter PyLint rules

webrtc/tools/py_event_log_analyzer/pb_parse.py

 #  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 #  Use of this source code is governed by a BSD-style license
 #  that can be found in the LICENSE file in the root of the source
 #  tree. An additional intellectual property rights grant can be found
 #  in the file PATENTS.  All contributing project authors may
 #  be found in the AUTHORS file in the root of the source tree.
 
 """Parses protobuf RTC dumps."""
 
@@ skipping 14 matching lines @@
     self.size = packet_size
     self.arrival_timestamp_ms = arrival_timestamp_us / 1000
     self.incoming = incoming
     header = struct.unpack_from("!HHII", rtp_header_str, 0)
     (first2header_bytes, self.sequence_number, self.timestamp,
      self.ssrc) = header
     self.payload_type = first2header_bytes & 0b01111111
     self.marker_bit = (first2header_bytes & 0b10000000) >> 7
 
 
-def parse_protobuf(file_path):
+def ParseProtobuf(file_path):
   """Parses RTC event log from protobuf file.
 
   Args:
        file_path: path to protobuf file of RTC event stream
 
   Returns:
     all RTP packet events from the event stream as a list of DataPoints
   """
   event_stream = rtc_pb.EventStream()
   with open(file_path, "rb") as f:
     event_stream.ParseFromString(f.read())
 
   return [DataPoint(event.rtp_packet.header,
                     event.rtp_packet.packet_length,
                     event.timestamp_us, event.rtp_packet.incoming)
           for event in event_stream.stream
           if event.HasField("rtp_packet")]