Rejigger ThemeService: move exposure of ThemeProvider interface to a

chrome/browser/ui/views/toolbar/toolbar_action_view.h

Index: chrome/browser/ui/views/toolbar/toolbar_action_view.h
diff --git a/chrome/browser/ui/views/toolbar/toolbar_action_view.h b/chrome/browser/ui/views/toolbar/toolbar_action_view.h
index 7df2efe3d819d95b4dc4cd2831a9ac023594da46..16456ae50308ca518e337637ed05cd74289249eb 100644
--- a/chrome/browser/ui/views/toolbar/toolbar_action_view.h
+++ b/chrome/browser/ui/views/toolbar/toolbar_action_view.h
@@ -40,7 +40,6 @@ class ToolbarActionView : public views::MenuButton,
                           public ToolbarActionViewDelegateViews,
                           public views::MenuButtonListener,
                           public views::ContextMenuController,
-                          public content::NotificationObserver,
                           public views::InkDropHost {
  public:
   // Need DragController here because ToolbarActionView could be
@@ -76,6 +75,7 @@ class ToolbarActionView : public views::MenuButton,
   ~ToolbarActionView() override;
 
   // views::MenuButton:
+  void OnThemeChanged() override;
   void GetAccessibleState(ui::AXViewState* state) override;
   scoped_ptr<views::LabelButtonBorder> CreateDefaultBorder() const override;
   void OnMouseEntered(const ui::MouseEvent& event) override;
@@ -89,11 +89,6 @@ class ToolbarActionView : public views::MenuButton,
   void OnMenuButtonClicked(views::View* sender,
                            const gfx::Point& point) override;
 
-  // content::NotificationObserver:
-  void Observe(int type,
-               const content::NotificationSource& source,
-               const content::NotificationDetails& details) override;
-
   // views::InkDropHost:
   void AddInkDropLayer(ui::Layer* ink_drop_layer) override;
   void RemoveInkDropLayer(ui::Layer* ink_drop_layer) override;