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

chrome/browser/ui/panels/panel_browser_window.cc

 // 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.
 
 #include "chrome/browser/ui/panels/panel_browser_window.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_finder.h"
@@ skipping 136 matching lines @@
 
 void PanelBrowserWindow::UpdateLoadingAnimations(bool should_animate) {
   native_panel_->UpdatePanelLoadingAnimations(should_animate);
 }
 
 void PanelBrowserWindow::SetStarredState(bool is_starred) {
   // Since panels are typically not bookmarked extension UI windows, they don't
   // have starred state.
 }
 
-void PanelBrowserWindow::SetZoomIconState(ZoomController::ZoomIconState state) {
-  // Since panels don't have an Omnibox, they don't have a zoom icon.
-}
-
-void PanelBrowserWindow::SetZoomIconTooltipPercent(int zoom_percent) {
-  // Since panels don't have an Omnibox, they don't have a zoom icon.
-}
-
-void PanelBrowserWindow::ShowZoomBubble(int zoom_percent) {
+void PanelBrowserWindow::ZoomChangedForActiveTab(bool can_show_bubble) {
   // Since panels don't have an Omnibox, they don't have a zoom icon, so no
-  // bubble will appear from it.
+  // view icon nor bubble will appear for this action.
 }
 
 void PanelBrowserWindow::EnterFullscreen(
       const GURL& url, FullscreenExitBubbleType type) {
   NOTIMPLEMENTED();
 }
 
 void PanelBrowserWindow::ExitFullscreen() {
   NOTIMPLEMENTED();
 }
@@ skipping 298 matching lines @@
 }
 
 void PanelBrowserWindow::TabInsertedAt(TabContents* contents,
                                        int index,
                                        bool foreground) {
   if (panel_->auto_resizable()) {
     DCHECK_EQ(0, index);
     panel_->EnableWebContentsAutoResize(contents->web_contents());
   }
 }