views: Extract TabIconViewModel into its own header file.

chrome/browser/ui/views/tab_icon_view.h

Index: chrome/browser/ui/views/tab_icon_view.h
diff --git a/chrome/browser/ui/views/tab_icon_view.h b/chrome/browser/ui/views/tab_icon_view.h
index f0108a806c7ae0087ba475bf9f7c49e1750b730a..79188ea52f403bdaaa699a9edd4fa7b6972e3efe 100644
--- a/chrome/browser/ui/views/tab_icon_view.h
+++ b/chrome/browser/ui/views/tab_icon_view.h
@@ -5,35 +5,26 @@
 #ifndef CHROME_BROWSER_UI_VIEWS_TAB_ICON_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_TAB_ICON_VIEW_H_
 
+#include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/views/view.h"
 
 class SkBitmap;
 
+namespace chrome {
+class TabIconViewModel;
+}
+
 namespace gfx {
 class ImageSkia;
 }
 
-////////////////////////////////////////////////////////////////////////////////
-//
 // A view to display a tab favicon or a throbber.
-//
-////////////////////////////////////////////////////////////////////////////////
 class TabIconView : public views::View {
  public:
-  // Classes implement this interface to provide state for the TabIconView.
-  class TabIconViewModel {
-   public:
-    // Returns true if the TabIconView should show a loading animation.
-    virtual bool ShouldTabIconViewAnimate() const = 0;
-
-    // Returns the favicon to display in the icon view
-    virtual gfx::ImageSkia GetFaviconForTabIconView() = 0;
-  };
-
   static void InitializeIfNeeded();
 
-  explicit TabIconView(TabIconViewModel* provider);
+  explicit TabIconView(chrome::TabIconViewModel* model);
   virtual ~TabIconView();
 
   // Invoke whenever the tab state changes or the throbber should update.
@@ -58,7 +49,7 @@ class TabIconView : public views::View {
                  bool filter);
 
   // Our model.
-  TabIconViewModel* model_;
+  chrome::TabIconViewModel* model_;
 
   // Whether the throbber is running.
   bool throbber_running_;