Move ZoomObserver, ZoomController and ZoomEventManager to components/.

chrome/browser/ui/views/location_bar/zoom_view.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_VIEWS_LOCATION_BAR_ZOOM_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ZOOM_VIEW_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/views/location_bar/bubble_icon_view.h"
 #include "chrome/browser/ui/views/location_bar/location_bar_view.h"
 
+namespace ui_zoom {
 class ZoomController;
+}
 
 // View for the zoom icon in the Omnibox.
 class ZoomView : public BubbleIconView {
  public:
   // Clicking on the ZoomView shows a ZoomBubbleView, which requires the current
   // WebContents. Because the current WebContents changes as the user switches
   // tabs, a LocationBarView::Delegate is supplied to queried for the current
   // WebContents when needed.
   explicit ZoomView(LocationBarView::Delegate* location_bar_delegate);
   ~ZoomView() override;
 
   // Updates the image and its tooltip appropriately, hiding or showing the icon
   // as needed.
-  void Update(ZoomController* zoom_controller);
+  void Update(ui_zoom::ZoomController* zoom_controller);
 
  protected:
   // BubbleIconView:
   bool IsBubbleShowing() const override;
   void OnExecuting(BubbleIconView::ExecuteSource source) override;
   void GetAccessibleState(ui::AXViewState* state) override;
 
  private:
   // The delegate used to get the currently visible WebContents.
   LocationBarView::Delegate* location_bar_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ZoomView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_LOCATION_BAR_ZOOM_VIEW_H_