Roll chromium to r494365 (#271)

This patch:
- rolls chromium to r494365
- starts using Runtime.evaluate(awaitPromise: true), with new semantic
  we can avoid additional Runtime.awaitPromise call
- stops resolving promises for Console event

lib/helper.js

@@ -54,16 +54,6 @@ class Helper {
    * @return {!Promise<!Object>}
    */
   static async serializeRemoteObject(client, remoteObject) {
-    if (remoteObject.subtype === 'promise') {
-      let response = (await client.send('Runtime.awaitPromise', {
-        promiseObjectId: remoteObject.objectId,
-        returnByValue: false
-      }));
-      Helper.releaseObject(client, remoteObject);
-      if (response.exceptionDetails)
-        throw new Error('Evaluation failed: ' + Helper.getExceptionMessage(response.exceptionDetails));
-      remoteObject = response.result;
-    }
     if (remoteObject.unserializableValue) {
       switch (remoteObject.unserializableValue) {
         case '-0':
@@ -80,6 +70,8 @@ class Helper {
     }
     if (!remoteObject.objectId)
       return remoteObject.value;
+    if (remoteObject.subtype === 'promise')
+      return remoteObject.description;
     try {
       let response = await client.send('Runtime.callFunctionOn', {
         objectId: remoteObject.objectId,