Make batch errors align with normal errors.

Fixes issue #169.

Reviewed in http://codereview.appspot.com/6444046/.
diff --git a/apiclient/http.py b/apiclient/http.py
index 1dfe36c..96d7a14 100644
--- a/apiclient/http.py
+++ b/apiclient/http.py
@@ -649,7 +649,6 @@
       resp, content = http.request(self.uri, self.method,
                                    body=self.body,
                                    headers=self.headers)
-
       if resp.status >= 300:
         raise HttpError(resp, content, self.uri)
     return self.postproc(resp, content)
@@ -1185,6 +1184,8 @@
       response = None
       exception = None
       try:
+        if resp.status >= 300:
+          raise HttpError(resp, content, request.uri)
         response = request.postproc(resp, content)
       except HttpError, e:
         exception = e