Move creation and ownership of HostZoomMap to content instead of having every embedder do this.

chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller.mm

 // Copyright (c) 2011 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.
 
 #import "chrome/browser/ui/cocoa/wrench_menu/wrench_menu_controller.h"
 
 #include "base/basictypes.h"
 #include "base/mac/bundle_locations.h"
 #include "base/mac/mac_util.h"
 #include "base/string16.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #import "chrome/browser/app_controller_mac.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #import "chrome/browser/ui/cocoa/accelerators_cocoa.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_menu_bridge.h"
 #import "chrome/browser/ui/cocoa/encoding_menu_controller_delegate_mac.h"
 #import "chrome/browser/ui/cocoa/toolbar/toolbar_controller.h"
 #import "chrome/browser/ui/cocoa/wrench_menu/menu_tracked_root_view.h"
 #include "chrome/browser/ui/toolbar/wrench_menu_model.h"
+#include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/browser/user_metrics.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/accelerators/accelerator_cocoa.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/models/menu_model.h"
@@ skipping 38 matching lines @@
     registrar_.Add(
         this, content::NOTIFICATION_ZOOM_LEVEL_CHANGED,
         content::NotificationService::AllBrowserContextsAndSources());
   }
 
   void Observe(int type,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) {
     DCHECK_EQ(type, content::NOTIFICATION_ZOOM_LEVEL_CHANGED);
     WrenchMenuModel* wrenchMenuModel = [controller_ wrenchMenuModel];
-    if (wrenchMenuModel->browser()->profile()->GetHostZoomMap() !=
+    if (HostZoomMap::GetForBrowserContext(
+            wrenchMenuModel->browser()->profile()) !=
         content::Source<HostZoomMap>(source).ptr()) {
       return;
     }
 
     wrenchMenuModel->UpdateZoomControls();
     const string16 level =
         wrenchMenuModel->GetLabelForCommandId(IDC_ZOOM_PERCENT_DISPLAY);
     [[controller_ zoomDisplay] setTitle:SysUTF16ToNSString(level)];
   }
 
@@ skipping 235 matching lines @@
     controller_ = controller;
   }
   return self;
 }
 
 - (IBAction)dispatchWrenchMenuCommand:(id)sender {
   [controller_ dispatchWrenchMenuCommand:sender];
 }
 
 @end  // @implementation WrenchMenuButtonViewController