ipn/ipnlocal: remove dead code now that Android uses LocalAPI instead

The new Android app and its libtailscale don't use this anymore;
it uses LocalAPI like other clients now.

Updates #11649

Change-Id: Ic9f42b41e0e0280b82294329093dc6c275f41d50
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

ipn/ipnlocal/state_test.go

@@ -264,6 +264,17 @@ func (cc *mockControl) UpdateEndpoints(endpoints []tailcfg.Endpoint) {
 	cc.called("UpdateEndpoints")
 }
 
+func (b *LocalBackend) nonInteractiveLoginForStateTest() {
+	b.mu.Lock()
+	if b.cc == nil {
+		panic("LocalBackend.assertClient: b.cc == nil")
+	}
+	cc := b.cc
+	b.mu.Unlock()
+
+	cc.Login(nil, b.loginFlags|controlclient.LoginInteractive)
+}
+
 // A very precise test of the sequence of function calls generated by
 // ipnlocal.Local into its controlclient instance, and the events it
 // produces upstream into the UI.
@@ -385,7 +396,7 @@ func TestStateMachine(t *testing.T) {
 	// then wait for us to respond.
 	t.Logf("\n\nLogin (noninteractive)")
 	notifies.expect(0)
-	b.Login(nil)
+	b.nonInteractiveLoginForStateTest()
 	{
 		cc.assertCalls("Login")
 		notifies.drain(0)
@@ -666,7 +677,7 @@ func TestStateMachine(t *testing.T) {
 		c.Assert(ipn.NeedsLogin, qt.Equals, b.State())
 	}
 
-	b.Login(nil)
+	b.StartLoginInteractive()
 	t.Logf("\n\nLoginFinished3")
 	notifies.expect(3)
 	cc.persist.UserProfile.LoginName = "user2"