How to remove an Android default app setting:
---Navigate to Settings.
---Enter the Apps menu. On some phones it will be called Application Manager or something similar.
---Swipe over to the All apps list.
---Select the app you want to remove as default.
---Tap Clear Defaults.
Now the next time you launch the link/file type that app was associated with, you will be prompted to choose a default app again. Note that you clear all defaults for an app at once. So if you choose Clear Defaults on the browser, you clear it as default for all of the links it was associated with.