Omnibox - ClipboardRecentContent - Make Proper Singleton

components/open_from_clipboard/clipboard_recent_content.cc

 // Copyright 2015 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 "components/open_from_clipboard/clipboard_recent_content.h"
 
 #include "url/url_constants.h"
 
 namespace {
 ClipboardRecentContent* g_clipboard_recent_content = nullptr;
 
 // Schemes appropriate for suggestion by ClipboardRecentContent.
 const char* kAuthorizedSchemes[] = {
     url::kAboutScheme, url::kDataScheme, url::kHttpScheme, url::kHttpsScheme,
     // TODO(mpearson): add support for chrome:// URLs.  Right now the scheme
     // for that lives in content and is accessible via
     // GetEmbedderRepresentationOfAboutScheme() or content::kChromeUIScheme
     // TODO(mpearson): when adding desktop support, add kFileScheme, kFtpScheme,
     // and kGopherScheme.
 };
 
 }  // namespace
 
 ClipboardRecentContent::ClipboardRecentContent() {}
 
 ClipboardRecentContent::~ClipboardRecentContent() {
-  g_clipboard_recent_content = nullptr;
 }
 
 // static
 ClipboardRecentContent* ClipboardRecentContent::GetInstance() {
   return g_clipboard_recent_content;
 }
 
 // static
-void ClipboardRecentContent::SetInstance(ClipboardRecentContent* instance) {
-  g_clipboard_recent_content = instance;
+void ClipboardRecentContent::SetInstance(
+    std::unique_ptr<ClipboardRecentContent> new_instance) {
+  delete g_clipboard_recent_content;
+  g_clipboard_recent_content = new_instance.release();
 }
 
 // static
 bool ClipboardRecentContent::IsAppropriateSuggestion(const GURL& url) {
   // Check to make sure it's a scheme we're willing to suggest.
   for (const auto* authorized_scheme : kAuthorizedSchemes) {
     if (url.SchemeIs(authorized_scheme))
       return true;
   }
 
   // Not a scheme we're allowed to return.
   return false;
 }