Do not exclude the last revision in the range returned by gitiles.

scripts/slave/recipe_modules/auto_bisect/example.expected/basic_bisect_script.json

 [
   {
     "cmd": [
       "git",
       "update-ref",
       "refs/heads/master",
       "refs/remotes/origin/master"
     ],
     "cwd": "[TMP_BASE]/fake_checkout_tmp_1",
     "name": "git update-ref"
@@ skipping 131 matching lines @@
       "https://chromium.googlesource.com/chromium/src"
     ],
     "name": "Expanding revision range.for revisions a6298e4afedbf2cd461755ea6f45b0ad64222222:00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111",
     "stdout": "/path/to/tmp/json",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_LOG_LINE@json.output@[@@@",
       "@@@STEP_LOG_LINE@json.output@  [@@@",
       "@@@STEP_LOG_LINE@json.output@    \"dcdcdc0ff1122212323134879ddceeb1240b0988\", @@@",
       "@@@STEP_LOG_LINE@json.output@    \"ignored\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  ], @@@",
+      "@@@STEP_LOG_LINE@json.output@  [@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"00316c9ddfb9d7b4e1ed2fff9fe6d964d2111111\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"ignored\"@@@",
       "@@@STEP_LOG_LINE@json.output@  ]@@@",
       "@@@STEP_LOG_LINE@json.output@]@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[build::gsutil]/resources/gsutil_wrapper.py",
@@ skipping 803 matching lines @@
       "{\"bisect_config\": {\"bad_revision\": \"314017\", \"bug_id\": \"-1\", \"builder_host\": \"master4.golo.chromium.org\", \"builder_port\": \"8341\", \"bypass_stats_check\": \"True\", \"command\": \"src/tools/perf/run_benchmark -v --browser=release smoothness.tough_scrolling_cases\", \"dummy_builds\": \"True\", \"dummy_job_names\": \"True\", \"dummy_tests\": \"True\", \"good_revision\": \"314015\", \"gs_bucket\": \"chrome-perf\", \"max_time_minutes\": \"5\", \"metric\": \"mean_input_event_latency/mean_input_event_latency\", \"recipe_tester_name\": \"linux_perf_tester\", \"repeat_count\": \"2\", \"skip_gclient_ops\": \"True\", \"test_type\": \"perf\"}, \"buildername\": \"linux_perf_bisect\", \"mastername\": \"tryserver.chromium.perf\", \"recipe\": \"auto_bisect:example\", \"slavename\": \"dummyslave\"}"
     ],
     "name": "Running Bisection"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]