Revert r42156, r42157, r42160. Allow dynamic switching in and out of sidetabs...

chrome/browser/tabs/tab_strip_model.cc

Index: chrome/browser/tabs/tab_strip_model.cc
===================================================================
--- chrome/browser/tabs/tab_strip_model.cc	(revision 42174)
+++ chrome/browser/tabs/tab_strip_model.cc	(working copy)
@@ -574,29 +574,15 @@
       return delegate_->CanRestoreTab();
     case CommandTogglePinned:
       return true;
-    case CommandBookmarkAllTabs:
+    case CommandBookmarkAllTabs: {
       return delegate_->CanBookmarkAllTabs();
-    case CommandUseVerticalTabs:
-      return true;
+    }
     default:
       NOTREACHED();
   }
   return false;
 }
 
-bool TabStripModel::IsContextMenuCommandChecked(
-    int context_index,
-    ContextMenuCommand command_id) const {
-  switch (command_id) {
-    case CommandUseVerticalTabs:
-      return delegate()->UseVerticalTabs();
-    default:
-      NOTREACHED();
-      break;
-  }
-  return false;
-}
-
 void TabStripModel::ExecuteContextMenuCommand(
     int context_index, ContextMenuCommand command_id) {
   DCHECK(command_id > CommandFirst && command_id < CommandLast);
@@ -670,12 +656,6 @@
       delegate_->BookmarkAllTabs();
       break;
     }
-    case CommandUseVerticalTabs: {
-      UserMetrics::RecordAction("TabContextMenu_UseVerticalTabs", profile_);
-
-      delegate()->ToggleUseVerticalTabs();
-      break;
-    }
     default:
       NOTREACHED();
   }