It is probably due to the fact that you cannot change your default browser in iOS.
Found this work-around, from here:
Method 2 : For all iOS users
Copy the code above and bookmark this page in safari .
Now open safari bookmarks, click edit and edit the just saved bookmark .
Rename your Bookmark to anything like Open in chrome .
Now your links can be opened in Google Chrome, if you open a link from within an app or email, it opens in safari, then hit the above bookmark to open it in chrome browser .
Any of the above methods can be used by a jailbroken user to set Google Chrome as default iOS browser while the regular users can