Add TimeToScrollUpdateSwapBegin2 to UKM

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index 5c2ab72ff53768100801c3a2b5026bd466f8480e..7f00fb51046525198fe4a6d4458f08e508718458 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -450,10 +450,6 @@ ContentBrowserClient::GetMemoryCoordinatorDelegate() {
   return nullptr;
 }
 
-::ukm::UkmRecorder* ContentBrowserClient::GetUkmRecorder() {
-  return nullptr;
-}
-
 std::unique_ptr<base::TaskScheduler::InitParams>
 ContentBrowserClient::GetTaskSchedulerInitParams() {
   return nullptr;