[tools/perf] Switch to config.GetBenchmarkByName

No longer need to import benchmark_runner module for this.

Depends on catapult CL landing first:
https://chromium-review.googlesource.com/c/catapult/+/1704194

Bug: 981349
Change-Id: Idec7329dad65533efd155cde10f4c5205acf0593
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1702318Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Auto-Submit: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678949}

tools/perf/fetch_benchmark_deps.py

@@ -18,9 +18,6 @@ from core import path_util
 path_util.AddPyUtilsToPath()
 from py_utils import cloud_storage
 
-path_util.AddTelemetryToPath()
-from telemetry import benchmark_runner
-
 from chrome_telemetry_build import chromium_config
 
 
@@ -118,8 +115,7 @@ def main(args):
                     os.path.join(perf_dir, 'contrib')]
     config = chromium_config.ChromiumConfig(
         top_level_dir=path_util.GetPerfDir(), benchmark_dirs=benchmark_dirs)
-    benchmark = benchmark_runner.GetBenchmarkByName(
-        options.benchmark_name, config)
+    benchmark = config.GetBenchmarkByName(options.benchmark_name)
     if not benchmark:
       raise ValueError('No such benchmark: %s' % options.benchmark_name)
     deps[benchmark.Name()] = _FetchDepsForBenchmark(benchmark)