Mandate unique_ptr for base::IDMap in IDMapOwnPointer mode.

content/shell/browser/layout_test/layout_test_permission_manager.cc

Index: content/shell/browser/layout_test/layout_test_permission_manager.cc
diff --git a/content/shell/browser/layout_test/layout_test_permission_manager.cc b/content/shell/browser/layout_test/layout_test_permission_manager.cc
index 48030a7a62d63f9f02336cf0bfa3c6caca3f21b8..35dd011fb2eb32d5831e85d15aef27b831f9457a 100644
--- a/content/shell/browser/layout_test/layout_test_permission_manager.cc
+++ b/content/shell/browser/layout_test/layout_test_permission_manager.cc
@@ -5,6 +5,7 @@
 #include "content/shell/browser/layout_test/layout_test_permission_manager.h"
 
 #include <list>
+#include <memory>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ -147,7 +148,7 @@ int LayoutTestPermissionManager::SubscribePermissionStatusChange(
     const base::Callback<void(blink::mojom::PermissionStatus)>& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
-  Subscription* subscription = new Subscription();
+  std::unique_ptr<Subscription> subscription = base::MakeUnique<Subscription>();

[danakj, 2016/11/30 00:34:01]

can auto

   subscription->permission =
       PermissionDescription(permission, requesting_origin, embedding_origin);
   subscription->callback = callback;
@@ -156,7 +157,7 @@ int LayoutTestPermissionManager::SubscribePermissionStatusChange(
                           subscription->permission.origin,
                           subscription->permission.embedding_origin);
 
-  return subscriptions_.Add(subscription);
+  return subscriptions_.Add(std::move(subscription));
 }
 
 void LayoutTestPermissionManager::UnsubscribePermissionStatusChange(