Refactor browser window zoom handling and enable zoom icon on all platforms.

chrome/browser/ui/gtk/location_bar_view_gtk.h

Index: chrome/browser/ui/gtk/location_bar_view_gtk.h
diff --git a/chrome/browser/ui/gtk/location_bar_view_gtk.h b/chrome/browser/ui/gtk/location_bar_view_gtk.h
index 4532c5a5a311c05738322244efa9def972aa56c1..57c5a91fb7a39bf6255112deb9069e324c7400e5 100644
--- a/chrome/browser/ui/gtk/location_bar_view_gtk.h
+++ b/chrome/browser/ui/gtk/location_bar_view_gtk.h
@@ -108,11 +108,7 @@ class LocationBarViewGtk : public OmniboxEditController,
   // Shows the Chrome To Mobile bubble.
   void ShowChromeToMobileBubble();
 
-  // Sets the tooltip for the zoom icon.
-  void SetZoomIconTooltipPercent(int zoom_percent);
-
-  // Sets the zoom icon state.
-  void SetZoomIconState(ZoomController::ZoomIconState zoom_icon_state);
+  void ZoomChangedForActiveTab(bool can_show_bubble);
 
   // Set the starred state of the bookmark star.
   void SetStarred(bool starred);