Move ChromeRequirementsChecker to //extensions as a PreloadCheck

chrome/browser/extensions/crx_installer.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/crx_installer.h"
 
 #include <map>
 #include <set>
 #include <utility>
 
@@ skipping 508 matching lines @@
         base::Bind(&CrxInstaller::OnInstallChecksComplete, this));
   }
 }
 
 void CrxInstaller::OnInstallChecksComplete(int failed_checks) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   if (!service_weak_)
     return;
 
   // Check for requirement errors.
-  if (!install_checker_->requirement_errors().empty()) {
+  if (!install_checker_->requirements_error_message().empty()) {
     if (error_on_unsupported_requirements_) {
-      ReportFailureFromUIThread(
-          CrxInstallError(CrxInstallError::ERROR_DECLINED,
-                          base::UTF8ToUTF16(base::JoinString(
-                              install_checker_->requirement_errors(), " "))));
+      ReportFailureFromUIThread(CrxInstallError(
+          CrxInstallError::ERROR_DECLINED,
+          base::UTF8ToUTF16(install_checker_->requirements_error_message())));
       return;
     }
     install_flags_ |= kInstallFlagHasRequirementErrors;
   }
 
   // Check the blacklist state.
   if (install_checker_->blacklist_error() == PreloadCheck::BLACKLISTED_ID) {
     install_flags_ |= kInstallFlagIsBlacklistedForMalware;
   }
 
@@ skipping 362 matching lines @@
         ExtensionInstallPrompt::GetReEnablePromptTypeForExtension(
             service->profile(), extension());
     client_->ShowDialog(base::Bind(&CrxInstaller::OnInstallPromptDone, this),
                         extension(), nullptr,
                         base::MakeUnique<ExtensionInstallPrompt::Prompt>(type),
                         ExtensionInstallPrompt::GetDefaultShowDialogCallback());
   }
 }
 
 }  // namespace extensions