Enforce the 'requirements' field in manifests.

chrome/browser/ui/webui/extensions/install_extension_handler.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/webui/extensions/install_extension_handler.h"
 
 #include "base/bind.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/crx_installer.h"
@@ skipping 69 matching lines @@
     return;
   }
 
   Browser* browser = browser::FindBrowserWithWebContents(
       web_ui()->GetWebContents());
   Profile* profile = browser->profile();
   scoped_refptr<extensions::CrxInstaller> crx_installer(
       extensions::CrxInstaller::Create(
           extensions::ExtensionSystem::Get(profile)->extension_service(),
           chrome::CreateExtensionInstallPromptWithBrowser(browser)));
+  crx_installer->set_error_on_unsported_requirements(true);
   crx_installer->set_off_store_install_allow_reason(
       extensions::CrxInstaller::OffStoreInstallAllowedFromSettingsPage);
 
   const bool kCaseSensitive = false;
 
   // Have to use EndsWith() because FilePath::Extension() would return ".js" for
   // "foo.user.js".
   if (EndsWith(file_to_install_.BaseName().value(),
                FILE_PATH_LITERAL(".user.js"),
                kCaseSensitive)) {
     crx_installer->InstallUserScript(
         file_to_install_,
         net::FilePathToFileURL(file_to_install_));
   } else if (EndsWith(file_to_install_.BaseName().value(),
                       FILE_PATH_LITERAL(".crx"),
                       kCaseSensitive)) {
     crx_installer->InstallCrx(file_to_install_);
   } else {
     CHECK(false);
   }
 
   file_to_install_.clear();
 }