[telemetry] Refactor run_tests to remove old cruft.

content/test/gpu/run_unittests

Index: content/test/gpu/run_unittests
diff --git a/content/test/gpu/run_unittests b/content/test/gpu/run_unittests
index ad8abfcb7cc4857a3a76fe6c77ba056cb165e03b..781a07356258f1ae19698a627ef973c11dc7ad5d 100755
--- a/content/test/gpu/run_unittests
+++ b/content/test/gpu/run_unittests
@@ -15,17 +15,10 @@ This script DOES NOT run benchmarks. run_gpu_tests does that.
 sys.path.append(os.path.join(os.path.dirname(__file__),
     os.pardir, os.pardir, os.pardir, 'tools', 'telemetry'))
 
-from telemetry.unittest import gtest_testrunner
 from telemetry.unittest import run_tests
 
 
 if __name__ == '__main__':
-  top_level_dir = os.path.abspath(os.path.dirname(__file__))
-  runner = gtest_testrunner.GTestTestRunner(print_result_after_run=False)
-  ret = run_tests.Main(sys.argv[1:], top_level_dir, top_level_dir, runner)
-
-  if runner.result:
-    runner.result.PrintSummary()
-    sys.exit(min(ret + runner.result.num_errors, 255))
-  else:
-    sys.exit(ret)
+  base_dir = os.path.dirname(os.path.realpath(__file__))
+  run_tests.environment = run_tests.Environment(base_dir, [base_dir])
+  sys.exit(run_tests.RunTestsCommand.main())