[Telemetry] Make --chartjson output chart.json instead of to stdout.

tools/telemetry/telemetry/benchmark.py

Index: tools/telemetry/telemetry/benchmark.py
diff --git a/tools/telemetry/telemetry/benchmark.py b/tools/telemetry/telemetry/benchmark.py
index 2a8ae336c1febe25fdfcf462cf8a81f6598ae7b9..5d2dcc5d1577b3b2d6927a1e789c815877438cd6 100644
--- a/tools/telemetry/telemetry/benchmark.py
+++ b/tools/telemetry/telemetry/benchmark.py
@@ -2,7 +2,6 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import json
 import logging
 import optparse
 import os
@@ -18,7 +17,6 @@ from telemetry.page import page_runner
 from telemetry.page import page_set
 from telemetry.page import page_test
 from telemetry.page import test_expectations
-from telemetry.results import chart_json
 from telemetry.results import results_options
 from telemetry.util import cloud_storage
 
@@ -98,13 +96,7 @@ class Benchmark(command_line.Command):
     except page_test.TestNotSupportedOnPlatformFailure as failure:
       logging.warning(str(failure))
 
-    if finder_options.chartjson:
-      print json.dumps(chart_json.ResultsAsChartDict(
-          benchmark_metadata,
-          results.all_page_specific_values,
-          results.all_summary_values))
-    else:
-      results.PrintSummary()
+    results.PrintSummary()
     return len(results.failures)
 
   def _DownloadGeneratedProfileArchive(self, options):