Bug 1106913 - Send errors from sendResponse/sendError back to chrome. r=whimboo

Errors that arise from inside sendResponse or sendError are currently
only logged to stdout.  Now that we have a pretty safe error.wrap
implementation we should serialise them and return them to the main
process so that they are not "lost" in stdout.

MozReview-Commit-ID: FuMeUqQ7CMv

--HG--
extra : rebase_source : 2d43eb63ec13dbfb461d72dd9ddee232ff4ff9d8

testing/marionette/listener.js

@@ -27,7 +27,6 @@ const {
 } = Cu.import("chrome://marionette/content/element.js", {});
 const {
   ElementNotInteractableError,
-  error,
   InsecureCertificateError,
   InvalidArgumentError,
   InvalidElementStateError,
@@ -490,7 +489,7 @@ function dispatch(fn) {
     });
 
     req.then(rv => sendResponse(rv, id), err => sendError(err, id))
-        .catch(error.report);
+        .catch(err => sendError(err, id));
   };
 }