Fix typo in gypv8sh debugging code

tools/gypv8sh.py

Index: tools/gypv8sh.py
diff --git a/tools/gypv8sh.py b/tools/gypv8sh.py
index 0c3d096368de38c92ae5ea053d7eaf7f21f3a6fd..ad6fa4a36328c24e7e7dc5df1b165fb773c395d4 100755
--- a/tools/gypv8sh.py
+++ b/tools/gypv8sh.py
@@ -50,8 +50,8 @@ def main ():
       if p.returncode:
         # TODO(jochen): Remove once crbug.com/370551 is resolved.
         if sys.platform == 'darwin':
-          cmd[:0] = [
-              'gdb', '-batch', '-ex', 'run', '-ex' 'bt', '-ex', 'quit', '-args']
+          cmd[:0] = ['gdb', '-batch', '-ex', 'run', '-ex', 'bt', '-ex', 'quit',
+                     '-args']
           p = subprocess.Popen(
               cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, bufsize=0)
           out, err = p.communicate()