Convert //content/browser from scoped_ptr to std::unique_ptr

content/browser/appcache/appcache_disk_cache.cc

Index: content/browser/appcache/appcache_disk_cache.cc
diff --git a/content/browser/appcache/appcache_disk_cache.cc b/content/browser/appcache/appcache_disk_cache.cc
index da5475d03d2194272c6de44a1052f6e1c0663e74..f5c718c7de7a2f1668d64bb44977fe90425c779d 100644
--- a/content/browser/appcache/appcache_disk_cache.cc
+++ b/content/browser/appcache/appcache_disk_cache.cc
@@ -39,7 +39,7 @@ class AppCacheDiskCache::CreateBackendCallbackShim
       appcache_diskcache_->OnCreateBackendComplete(rv);
   }
 
-  scoped_ptr<disk_cache::Backend> backend_ptr_;  // Accessed directly.
+  std::unique_ptr<disk_cache::Backend> backend_ptr_;  // Accessed directly.
 
  private:
   friend class base::RefCounted<CreateBackendCallbackShim>;