Move InfoBarResponder into its own file.

chrome/browser/infobars/infobar_responder.cc

Index: chrome/browser/infobars/infobar_responder.cc
diff --git a/chrome/browser/infobars/infobar_responder.cc b/chrome/browser/infobars/infobar_responder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f1658f5501f3d3c10d35cb406c81c77b08e08eea
--- /dev/null
+++ b/chrome/browser/infobars/infobar_responder.cc
@@ -0,0 +1,42 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/infobars/infobar_responder.h"
+
+#include "base/bind.h"
+#include "base/message_loop/message_loop.h"
+#include "chrome/browser/infobars/infobar_service.h"
+#include "components/infobars/core/confirm_infobar_delegate.h"
+#include "components/infobars/core/infobar.h"
+
+InfoBarResponder::InfoBarResponder(InfoBarService* infobar_service, bool accept)
+    : infobar_service_(infobar_service), accept_(accept), has_observed_(false) {
+  infobar_service_->AddObserver(this);
+}
+
+InfoBarResponder::~InfoBarResponder() {
+  infobar_service_->RemoveObserver(this);
+}
+
+void InfoBarResponder::OnInfoBarAdded(infobars::InfoBar* infobar) {
+  if (has_observed_)
+    return;
+  has_observed_ = true;

[Peter Kasting, 2015/04/23 00:14:08]

Seems like you could also just do "infobar_service_->RemoveObserver(this);", and
eliminate the need for this variable entirely.

[Michael van Ouwerkerk, 2015/04/23 13:36:09]

I thought I tried that when I originally wrote this, but testing it now it seems
fine, so Done.

+  ConfirmInfoBarDelegate* delegate =
+      infobar->delegate()->AsConfirmInfoBarDelegate();
+  DCHECK(delegate);
+
+  // Respond to the infobar asynchronously, like a person.

[Peter Kasting, 2015/04/23 00:14:08]

Nit: I don't think this comment adds anything

[Michael van Ouwerkerk, 2015/04/23 13:36:09]

Done.

+  base::MessageLoop::current()->PostTask(
+      FROM_HERE,
+      base::Bind(&InfoBarResponder::Respond, base::Unretained(this), delegate));
+}
+
+void InfoBarResponder::Respond(ConfirmInfoBarDelegate* delegate) {
+  if (accept_) {

[Peter Kasting, 2015/04/23 00:14:08]

Nit: No {}

[Michael van Ouwerkerk, 2015/04/23 13:36:09]

Done.

+    delegate->Accept();
+  } else {
+    delegate->Cancel();
+  }
+}