[Web Intents] Refactor picker to use WebIntentPickerModel.

chrome/browser/ui/intents/web_intent_picker_model_observer.h

+// Copyright (c) 2012 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.
+
+#ifndef CHROME_BROWSER_UI_INTENTS_WEB_INTENT_PICKER_MODEL_OBSERVER_H_
+#define CHROME_BROWSER_UI_INTENTS_WEB_INTENT_PICKER_MODEL_OBSERVER_H_
+#pragma once
+
+class WebIntentPickerModel;
+
+// Observer for changes to the WebIntentPickerModel.
+class WebIntentPickerModelObserver {
+ public:
+  virtual ~WebIntentPickerModelObserver() {}
+
+  // Called when |model| has changed.
+  virtual void OnModelChanged(WebIntentPickerModel* model) = 0;
+
+  // Called when the favicon at |index| in |model| has changed.
+  virtual void OnFaviconChanged(WebIntentPickerModel* model, size_t index) = 0;
+
+  // Called when the inline disposition should be displayed for |model|.
+  virtual void OnInlineDisposition(WebIntentPickerModel* model) = 0;
+};
+
+#endif  // CHROME_BROWSER_UI_INTENTS_WEB_INTENT_PICKER_MODEL_OBSERVER_H_