[DevTools] Refactor connection-related classes.

third_party/WebKit/Source/devtools/front_end/audits2_worker/Audits2Service.js

Index: third_party/WebKit/Source/devtools/front_end/audits2_worker/Audits2Service.js
diff --git a/third_party/WebKit/Source/devtools/front_end/audits2_worker/Audits2Service.js b/third_party/WebKit/Source/devtools/front_end/audits2_worker/Audits2Service.js
index 29e0293e20a5ede5d560b2dd617446c8fe806662..3f7f7c0738c6c04aa91b3a40bec74b0c3481cd4b 100644
--- a/third_party/WebKit/Source/devtools/front_end/audits2_worker/Audits2Service.js
+++ b/third_party/WebKit/Source/devtools/front_end/audits2_worker/Audits2Service.js
@@ -34,12 +34,15 @@ Audits2Service.prototype = {
     },
 
     /**
-     * @param {!Object=} params
+     * @param {{message: !Object|string}} params

[pfeldman, 2016/10/21 21:04:34]

design: we should not use either or typing.

      * @return {!Promise}
      */
     dispatchProtocolMessage: function(params)
     {
-        console.error("message: " + JSON.stringify(params));
+        var message = params.message;
+        if (typeof message !== "string")
+            message = JSON.stringify(message);
+        console.error("message: " + message.substring(0, 100));
         return Promise.resolve();
     },