The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/b075b96a487f84a2d9b87a67af4ff5ab4ef336ac

commit b075b96a487f84a2d9b87a67af4ff5ab4ef336ac
Author: Cathal Weakliam <cweakliam@google.com>
Date: Wed Jun 21 19:25:19 2017

Remove StacktraceParser interface.

This interface no longer serves any purpose, as no code in Predator
works with it, only with specific subclasses of it.

Also its only non-abstract method, ``FilterStackBuffer``, is not
executed anywhere except tests. Its functionality is duplicated
elsewhere, in the ``Stacktrace.AddFilteredStack`` method.

R=katesonia@google.com

Bug:  733854 
Change-Id: I3f845de1b936c26db65ab1d1826f826f69f1f992
Reviewed-on: https://chromium-review.googlesource.com/538868
Commit-Queue: Cathal Weakliam <cweakliam@google.com>
Reviewed-by: Sharu Jiang <katesonia@chromium.org>

[delete] https://crrev.com/58d03699896f4c7935422422a651a8dbad172b61/appengine/predator/analysis/stacktrace_parser.py
[modify] https://crrev.com/b075b96a487f84a2d9b87a67af4ff5ab4ef336ac/appengine/predator/analysis/chromecrash_parser.py
[modify] https://crrev.com/b075b96a487f84a2d9b87a67af4ff5ab4ef336ac/appengine/predator/analysis/clusterfuzz_parser.py
[delete] https://crrev.com/58d03699896f4c7935422422a651a8dbad172b61/appengine/predator/analysis/test/stacktrace_parser_test.py
[modify] https://crrev.com/b075b96a487f84a2d9b87a67af4ff5ab4ef336ac/appengine/predator/analysis/uma_sampling_profiler_parser.py