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

chrome/browser/ui/panels/panel_browser_window.h

Index: chrome/browser/ui/panels/panel_browser_window.h
diff --git a/chrome/browser/ui/panels/panel_browser_window.h b/chrome/browser/ui/panels/panel_browser_window.h
index 895919f023b758e88fac8ee7ccc00d1e724ccbdd..12c1478a0c584de11b9d75c3f6594e73d46992be 100644
--- a/chrome/browser/ui/panels/panel_browser_window.h
+++ b/chrome/browser/ui/panels/panel_browser_window.h
@@ -60,9 +60,7 @@ class PanelBrowserWindow : public BrowserWindow,
   virtual void SetDevToolsDockSide(DevToolsDockSide side) OVERRIDE;
   virtual void UpdateLoadingAnimations(bool should_animate) OVERRIDE;
   virtual void SetStarredState(bool is_starred) OVERRIDE;
-  virtual void SetZoomIconState(ZoomController::ZoomIconState state) OVERRIDE;
-  virtual void SetZoomIconTooltipPercent(int zoom_percent) OVERRIDE;
-  virtual void ShowZoomBubble(int zoom_percent) OVERRIDE;
+  virtual void ZoomChangedForActiveTab(bool can_show_bubble) OVERRIDE;
   virtual void EnterFullscreen(
       const GURL& url, FullscreenExitBubbleType type) OVERRIDE;
   virtual void ExitFullscreen() OVERRIDE;