logging: serialize -> stringify (#1429)

Author: stephenplusplus

lib/logging/entry.js

@@ -161,7 +161,7 @@ Entry.prototype.toJSON = function() {
 
   if (is.object(this.data)) {
     entry.jsonPayload = GrpcService.objToStruct_(this.data, {
-      serialize: true
+      stringify: true
     });
   } else if (is.string(this.data)) {
     entry.textPayload = this.data;

test/logging/entry.js

@@ -185,7 +185,7 @@ describe('Entry', function() {
       FakeGrpcService.objToStruct_ = function(obj, options) {
         assert.strictEqual(obj, input);
         assert.deepEqual(options, {
-          serialize: true
+          stringify: true
         });
         return converted;
       };