Default zoom was never read from chrome://settings

chrome/browser/ui/browser_command_controller.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/browser_command_controller.h"
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 1124 matching lines @@
   UpdateCommandsForFind();
   // Update the zoom commands when an active tab is selected.
   UpdateCommandsForZoomState();
 }
 
 void BrowserCommandController::UpdateCommandsForZoomState() {
   WebContents* contents =
       browser_->tab_strip_model()->GetActiveWebContents();
   if (!contents)
     return;
-  command_updater_.UpdateCommandEnabled(IDC_ZOOM_PLUS, CanZoomIn(contents));
-  command_updater_.UpdateCommandEnabled(IDC_ZOOM_NORMAL, ActualSize(contents));
-  command_updater_.UpdateCommandEnabled(IDC_ZOOM_MINUS, CanZoomOut(contents));
+  command_updater_.UpdateCommandEnabled(IDC_ZOOM_PLUS,
+                                        IsAtMaximumZoom(contents));
+  command_updater_.UpdateCommandEnabled(IDC_ZOOM_NORMAL,
+                                        !IsAtDefaultZoom(contents));
+  command_updater_.UpdateCommandEnabled(IDC_ZOOM_MINUS,
+                                        IsAtMinimumZoom(contents));
 }
 
 void BrowserCommandController::UpdateCommandsForContentRestrictionState() {
   int restrictions = GetContentRestrictions(browser_);
 
   command_updater_.UpdateCommandEnabled(
       IDC_COPY, !(restrictions & CONTENT_RESTRICTION_COPY));
   command_updater_.UpdateCommandEnabled(
       IDC_CUT, !(restrictions & CONTENT_RESTRICTION_CUT));
   command_updater_.UpdateCommandEnabled(
@@ skipping 195 matching lines @@
 
 BrowserWindow* BrowserCommandController::window() {
   return browser_->window();
 }
 
 Profile* BrowserCommandController::profile() {
   return browser_->profile();
 }
 
 }  // namespace chrome