Backed out changeset f5f5cbb377ac (bug 1563358) for eslint failure at /marionette/reftest.js on a CLOSED TREE.

testing/marionette/reftest.js

@@ -324,14 +324,11 @@ max-width: ${width}px; max-height: ${height}px`;
           extras
         );
       } catch (e) {
-        comparison = { lhs: null, rhs: null, passed: false, error: e, msg: null };
-      }
-      if (comparison.msg) {
-        result.message += `${comparison.msg}\n`;
+        comparison = { lhs: null, rhs: null, passed: false, error: e };
       }
       if (comparison.error !== null) {
         result.status = STATUS.ERROR;
-        result.message += String(comparison.error);
+        result.message = String(comparison.error);
         result.stack = comparison.error.stack;
       }
 
@@ -415,7 +412,6 @@ max-width: ${width}px; max-height: ${height}px`;
     let error = null;
     let pixelsDifferent = null;
     let maxDifferences = {};
-    let msg = null;
 
     try {
       pixelsDifferent = this.windowUtils.compareCanvases(
@@ -437,8 +433,10 @@ max-width: ${width}px; max-height: ${height}px`;
       switch (relation) {
         case "==":
           if (!passed) {
-              msg = `Found ${pixelsDifferent} pixels different, ` +
+            logger.info(
+              `Found ${pixelsDifferent} pixels different, ` +
                 `maximum difference per channel ${maxDifferences.value}`
+            );
           }
           break;
         case "!=":
@@ -450,7 +448,7 @@ max-width: ${width}px; max-height: ${height}px`;
           );
       }
     }
-    return { lhs, rhs, passed, error, msg };
+    return { lhs, rhs, passed, error };
   }
 
   isAcceptableDifference(maxDifference, pixelsDifferent, allowed) {