Removing extensions::FeatureSwitch which is no longer used

chrome/browser/extensions/extension_install_prompt.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/extensions/extension_install_prompt.h"
 
 #include <map>
 
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 719 matching lines @@
   show_dialog_callback_ = show_dialog_callback;
 
   // We special-case themes to not show any confirm UI. Instead they are
   // immediately installed, and then we show an infobar (see OnInstallSuccess)
   // to allow the user to revert if they don't like it.
   //
   // We don't do this in the case where off-store extension installs are
   // disabled because in that case, we don't show the dangerous download UI, so
   // we need the UI confirmation.
   if (extension->is_theme()) {
-    if (extension->from_webstore() ||
-        extensions::FeatureSwitch::easy_off_store_install()->IsEnabled()) {
+    if (extension->from_webstore()) {
       delegate->InstallUIProceed();
       return;
     }
   }
 
   LoadImageIfNeeded();
 }
 
 void ExtensionInstallPrompt::ConfirmReEnable(Delegate* delegate,
                                              const Extension* extension) {
@@ skipping 192 matching lines @@
   }
 
   if (AutoConfirmPrompt(delegate_))
     return;
 
   if (show_dialog_callback_.is_null())
     GetDefaultShowDialogCallback().Run(show_params_, delegate_, prompt_);
   else
     show_dialog_callback_.Run(show_params_, delegate_, prompt_);
 }