Disable zoom-in and zoom-out buttons in toolbar menu for a crashed page.

chrome/browser/ui/views/toolbar/app_menu.cc

 // Copyright 2013 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/views/toolbar/app_menu.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <cmath>
 #include <set>
 
 #include "base/i18n/number_formatting.h"
 #include "base/macros.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/bookmarks/bookmark_model_factory.h"
 #include "chrome/browser/bookmarks/bookmark_stats.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/toolbar/app_menu_model.h"
 #include "chrome/browser/ui/views/bookmarks/bookmark_menu_delegate.h"
 #include "chrome/browser/ui/views/toolbar/app_menu_observer.h"
 #include "chrome/browser/ui/views/toolbar/extension_toolbar_menu_view.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "components/ui/zoom/page_zoom.h"
 #include "components/ui/zoom/zoom_controller.h"
@@ skipping 588 matching lines @@
     return menu() ?
         menu()->browser_->tab_strip_model()->GetActiveWebContents() :
         nullptr;
   }
 
   void OnZoomLevelChanged(const content::HostZoomMap::ZoomLevelChange& change) {
     UpdateZoomControls();
   }
 
   void UpdateZoomControls() {
-    WebContents* selected_tab = GetActiveWebContents();
+    WebContents* contents = GetActiveWebContents();
     int zoom = 100;
-    if (selected_tab) {
+    if (contents) {
       auto zoom_controller =
-          ui_zoom::ZoomController::FromWebContents(selected_tab);
+          ui_zoom::ZoomController::FromWebContents(contents);
       if (zoom_controller)
         zoom = zoom_controller->GetZoomPercent();
       increment_button_->SetEnabled(zoom <
-                                    selected_tab->GetMaximumZoomPercent());
+                                    contents->GetMaximumZoomPercent());
       decrement_button_->SetEnabled(zoom >
-                                    selected_tab->GetMinimumZoomPercent());
+                                    contents->GetMinimumZoomPercent());
     }
     zoom_label_->SetText(base::FormatPercent(zoom));
     zoom_label_max_width_valid_ = false;
   }
 
   // Returns the max width the zoom string can be.
   int ZoomLabelMaxWidth() const {
     if (!zoom_label_max_width_valid_) {
       const gfx::FontList& font_list = zoom_label_->font_list();
       int border_width = zoom_label_->border()
@@ skipping 602 matching lines @@
                                 0,
                                 BookmarkMenuDelegate::SHOW_PERMANENT_FOLDERS,
                                 BOOKMARK_LAUNCH_LOCATION_APP_MENU);
 }
 
 int AppMenu::ModelIndexFromCommandId(int command_id) const {
   CommandIDToEntry::const_iterator ix = command_id_to_entry_.find(command_id);
   DCHECK(ix != command_id_to_entry_.end());
   return ix->second.second;
 }