[Edge] Use getWebView(false) in registerFunctionScript to avoid pumping past NavigationCompleted#3256

HeikoKlare wants to merge 1 commit intoeclipse-platform:mastereclipse-platform/eclipse.platform.swt:masterfrom

HeikoKlare:fix/edge-registerFunctionScript-getWebViewHeikoKlare/eclipse.platform.swt:fix/edge-registerFunctionScript-getWebViewCopy head branch name to clipboard