Move 'Extensions' to the main menu for settings-in-a-window

BUG=407162

Review URL: https://codereview.chromium.org/511923002

Cr-Commit-Position: refs/heads/master@{#292492}

chrome/browser/ui/toolbar/wrench_menu_model.cc

@@ -249,7 +249,9 @@ void ToolsMenuModel::Build(Browser* browser) {
     AddSeparator(ui::NORMAL_SEPARATOR);
   }
 
-  AddItemWithStringId(IDC_MANAGE_EXTENSIONS, IDS_SHOW_EXTENSIONS);
+  // If settings-in-a-window is enabled the Extensions item is at the top level.
+  if (!::switches::SettingsWindowEnabled())
+    AddItemWithStringId(IDC_MANAGE_EXTENSIONS, IDS_SHOW_EXTENSIONS);
 
   if (chrome::CanOpenTaskManager())
     AddItemWithStringId(IDC_TASK_MANAGER, IDS_TASK_MANAGER);
@@ -595,6 +597,9 @@ void WrenchMenuModel::Build() {
 
   AddItemWithStringId(IDC_SHOW_HISTORY, IDS_SHOW_HISTORY);
   AddItemWithStringId(IDC_SHOW_DOWNLOADS, IDS_SHOW_DOWNLOADS);
+  // If settings-in-a-window is enabled the Extensions item is at the top level.
+  if (::switches::SettingsWindowEnabled())
+    AddItemWithStringId(IDC_MANAGE_EXTENSIONS, IDS_SHOW_EXTENSIONS);
   AddSeparator(ui::NORMAL_SEPARATOR);
 
 #if !defined(OS_CHROMEOS)