Fix Closure Compiler's compile.py error checking

third_party/closure_compiler/compile.py

Index: third_party/closure_compiler/compile.py
diff --git a/third_party/closure_compiler/compile.py b/third_party/closure_compiler/compile.py
index c9dcc50b352894d879dee247f2529b6a20f59866..5f99bfc22b6379bbde304c1ed72b5990a25aec55 100755
--- a/third_party/closure_compiler/compile.py
+++ b/third_party/closure_compiler/compile.py
@@ -221,18 +221,17 @@ class Checker(object):
 
     processed_runner_args = ["--%s" % arg for arg in runner_args or []]
     processed_runner_args += ["--compiler-args-file=%s" % args_file]
-    _, stderr = self._run_jar(self._runner_jar, processed_runner_args)
+    return_code, stderr = self._run_jar(self._runner_jar, processed_runner_args)
 
     errors = stderr.strip().split("\n\n")
     maybe_summary = errors.pop()
 
-    if re.search(".*error.*warning.*typed", maybe_summary):
+    if return_code == 0:
       self._log_debug("Summary: %s" % maybe_summary)
     else:
-      # Not a summary. Running the jar failed. Bail.
+      # Running the jar failed.
       self._log_error(stderr)
       self._nuke_temp_files()
-      sys.exit(1)
 
     if errors and out_file:
       if os.path.exists(out_file):