Revert of Use the crrev recipe module to fetch commit hashes.

scripts/slave/recipes/bisect_test/example_bisect_results.py

Index: scripts/slave/recipes/bisect_test/example_bisect_results.py
diff --git a/scripts/slave/recipes/bisect_test/example_bisect_results.py b/scripts/slave/recipes/bisect_test/example_bisect_results.py
index efda0a2926e573ebc75fa6a73824c18bc03b947c..09f625fc852567d27319579349b56b3d21c172aa 100644
--- a/scripts/slave/recipes/bisect_test/example_bisect_results.py
+++ b/scripts/slave/recipes/bisect_test/example_bisect_results.py
@@ -90,11 +90,9 @@
 
 
 def add_revision_mapping(api, test, pos, sha):
-  step_name = ('Resolving reference range.crrev get commit hash for ' +
-               'refs/heads/master@{#%s}' % pos)
-  stdout = api.json.output({'git_sha': sha})
+  step_name = 'Resolving reference range.resolving commit_pos ' + pos
+  stdout = api.raw_io.output('hash:' + sha)
   test += api.step_data(step_name, stdout=stdout)
-
   step_name = 'Resolving reference range.resolving hash ' + sha
   pos = 'refs/heads/master@{#%s}' % pos
   stdout = api.raw_io.output(pos)