The regression test added for an issue with the Edge implementation
running out of handles because of too many timer being instantiated
currently creates thousands of browser functions. The actual issue
occurs because of too many calls to processOSMessagesUntil(), each
creating a timer. This already happens when accessing the WebView
instance through the setText() call inside the test. Thus, the creation
of browser functions in the test is obsolete, which is why this change
removes it.

Contributes to
https://github.com/eclipse-platform/eclipse.platform.swt/issues/2806