Fix wxWebView test setup failure under OS X.

Call LoadUrl() after associating our custom event handler with the browser
object as otherwise the wxEVT_WEBVIEW_LOADED event could be generated before
we were set up to catch it, resulting in the assertion failure inside
ENSURE_LOADED.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73852 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Fix compilation-breaking typo in the previous commit.

s/LoadUrl/LoadURL/

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@73853 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775