- Prevent running of the dart_bootstrap script by default.

tools/utils.py

Index: tools/utils.py
diff --git a/tools/utils.py b/tools/utils.py
index a6e7f5181c9ab850ab2433461307519d18095d71..efcb886bfc5935b28d2e2b3e5945730055732d7f 100644
--- a/tools/utils.py
+++ b/tools/utils.py
@@ -634,8 +634,9 @@ def CheckedInSdkCheckExecutable():
   canary_script = os.path.join(os.path.dirname(os.path.realpath(__file__)),
                                'canary.dart')
   try:
-    if 42 == subprocess.call([executable, canary_script]):
-      return True
+    with open(os.devnull, 'wb') as silent_sink:
+      if 0 == subprocess.call([executable, canary_script], stdout=silent_sink):
+        return True
   except OSError as e:
     pass
   return False