fix chrome tasks (#230)

* fix chrome

* fix: fix proxy setup

* feat&fix: add proxy support in setup and remove hardcoded proxy from example

* fix tasks

* fix chrome finished

* fix

* clean chrome_fix code

* clean chrome_fix code

---------

Co-authored-by: adlsdztony <zzl0712@connect.hku.hk>

evaluation_examples/examples/chrome/e1e75309-3ddb-4d09-92ec-de869c928143.json

@@ -1,7 +1,7 @@
 {
   "id": "e1e75309-3ddb-4d09-92ec-de869c928143",
   "snapshot": "chrome",
-  "instruction": "Computer, can you turn the webpage I'm looking at into a PDF file and put it on my main screen, you know, the Desktop?",
+  "instruction": "Computer, can you turn the webpage I'm looking at into a PDF file, save it to my Desktop with the default filename and set the margins to none?",
   "source": "https://in5stepstutorials.com/google-chrome/save-web-page-as-pdf-in-chrome.php",
   "config": [
     {