shdocvw: Return correct error from WebBrowser::Quit.

dlls/shdocvw/tests/webbrowser.c

@@ -1147,6 +1147,11 @@ static void test_ie_funcs(IUnknown *unk)
     hres = IWebBrowser2_get_Application(wb, NULL);
     ok(hres == E_POINTER, "get_Application failed: %08x, expected E_POINTER\n", hres);
 
+    /* Quit */
+
+    hres = IWebBrowser2_Quit(wb);
+    ok(hres == E_FAIL, "Quit failed: %08x, expected E_FAIL\n", hres);
+
     IWebBrowser2_Release(wb);
 }
 

dlls/shdocvw/webbrowser.c

@@ -457,8 +457,11 @@ static HRESULT WINAPI WebBrowser_get_Busy(IWebBrowser2 *iface, VARIANT_BOOL *pBo
 static HRESULT WINAPI WebBrowser_Quit(IWebBrowser2 *iface)
 {
     WebBrowser *This = WEBBROWSER_THIS(iface);
-    FIXME("(%p)\n", This);
-    return E_NOTIMPL;
+
+    TRACE("(%p)\n", This);
+
+    /* It's a InternetExplorer specific method, we have nothing to do here. */
+    return E_FAIL;
 }
 
 static HRESULT WINAPI WebBrowser_ClientToWindow(IWebBrowser2 *iface, int *pcx, int *pcy)