Disable AuthenticatorDialogTest InvokeUi_ble_enter_pairing_mode.

TBR=engedy@chromium.org
NOTRY=true (disabling test)

Bug: 875531
Change-Id: I49704faa3bc9447b0189d8b38e665f647ec2cc23
Reviewed-on: https://chromium-review.googlesource.com/1180537Reviewed-by: apacible <apacible@chromium.org>
Commit-Queue: apacible <apacible@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584264}

chrome/browser/ui/webauthn/authenticator_dialog_browsertest.cc

@@ -110,8 +110,9 @@ IN_PROC_BROWSER_TEST_F(AuthenticatorDialogTest, InvokeUi_ble_pairing_begin) {
   ShowAndVerifyUi();
 }
 
+// Disabled because flaky on bots. http://crbug.com/875531.
 IN_PROC_BROWSER_TEST_F(AuthenticatorDialogTest,
-                       InvokeUi_ble_enter_pairing_mode) {
+                       DISABLE_InvokeUi_ble_enter_pairing_mode) {
   ShowAndVerifyUi();
 }