Parse Drive API responses all at once in the blocking pool.

google_apis/drive/base_requests.h

Index: google_apis/drive/base_requests.h
diff --git a/google_apis/drive/base_requests.h b/google_apis/drive/base_requests.h
index afe12a04fbef7ee5dac09b43bb35c136d16f8323..d9fbfaeb1583cad993888ac91803c2e28012a11e 100644
--- a/google_apis/drive/base_requests.h
+++ b/google_apis/drive/base_requests.h
@@ -29,10 +29,6 @@ namespace google_apis {
 
 class RequestSender;
 
-// Callback used to pass parsed JSON from ParseJson(). If parsing error occurs,
-// then the passed argument is null.
-typedef base::Callback<void(scoped_ptr<base::Value> value)> ParseJsonCallback;
-
 // Callback used for DownloadFileRequest and ResumeUploadRequestBase.
 typedef base::Callback<void(int64 progress, int64 total)> ProgressCallback;
 
@@ -41,12 +37,8 @@ typedef base::Callback<void(
     GDataErrorCode error,
     scoped_ptr<std::string> content)> GetContentCallback;
 
-// Parses JSON passed in |json| on |blocking_task_runner|. Runs |callback| on
-// the calling thread when finished with either success or failure.
-// The callback must not be null.
-void ParseJson(base::TaskRunner* blocking_task_runner,
-               const std::string& json,
-               const ParseJsonCallback& callback);
+// Parses JSON passed in |json|. Returns NULL on failure.
+scoped_ptr<base::Value> ParseJson(const std::string& json);
 
 //======================= AuthenticatedRequestInterface ======================