| Index: build/android/pylib/instrumentation/test_runner.py
 | 
| diff --git a/build/android/pylib/instrumentation/test_runner.py b/build/android/pylib/instrumentation/test_runner.py
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| index ec0baeea1c3647d2ba81b568b1ab6209efec6639..424dcb3b1a564e511a528730c1c7716b41ceffe1 100644
 | 
| --- a/build/android/pylib/instrumentation/test_runner.py
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| +++ b/build/android/pylib/instrumentation/test_runner.py
 | 
| @@ -237,10 +237,8 @@ class TestRunner(base_test_runner.BaseTestRunner):
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|            '/data/data/com.google.android.apps.chrome/files/PerfTestData.txt',
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|            as_root=True)
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|  
 | 
| -      if json_string:
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| -        json_string = '\n'.join(json_string)
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| -      else:
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| -        raise Exception('Perf file does not exist or is empty')
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| +      if not json_string:
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| +        raise Exception('Perf file is empty')
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|  
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|        if self.options.save_perf_json:
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|          json_local_file = '/tmp/chromium-android-perf-json-' + raw_test_name
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| 
 |