Enable Chrome Sandbox with run_test_cases.py

tools/isolate/run_test_cases_smoke_test.py

Index: tools/isolate/run_test_cases_smoke_test.py
diff --git a/tools/isolate/run_test_cases_smoke_test.py b/tools/isolate/run_test_cases_smoke_test.py
index 855643fcd432f493187d08c3bc79b412cda1d09e..ba307244531d48b3aeca464fe2091ac14d7165f8 100755
--- a/tools/isolate/run_test_cases_smoke_test.py
+++ b/tools/isolate/run_test_cases_smoke_test.py
@@ -39,6 +39,7 @@ class TraceTestCases(unittest.TestCase):
     # Make sure there's no environment variable that could do side effects.
     os.environ.pop('GTEST_SHARD_INDEX', '')
     os.environ.pop('GTEST_TOTAL_SHARDS', '')
+    os.environ.pop('CHROME_DEVEL_SANDBOX','')
 
     self.filename = 'test.results'
 
@@ -77,6 +78,8 @@ class TraceTestCases(unittest.TestCase):
     self.assertEquals(0, return_code)
 
     expected_out_re = [
+      r'Disabling sandbox. Setting environment variable:',
+      r'  CHROME_DEVEL_SANDBOX=""',
       r'\[\d/\d\]   \d\.\d\ds .+',
       r'\[\d/\d\]   \d\.\d\ds .+',
       r'\[\d/\d\]   \d\.\d\ds .+',
@@ -102,6 +105,8 @@ class TraceTestCases(unittest.TestCase):
     self.assertEquals(1, return_code)
 
     expected_out_re = [
+      r'Disabling sandbox. Setting environment variable:',
+      r'  CHROME_DEVEL_SANDBOX=""',
       r'\[\d/\d\]   \d\.\d\ds .+',
       r'\[\d/\d\]   \d\.\d\ds .+',
       r'\[\d/\d\]   \d\.\d\ds .+',