Roll Chrome into Mojo.

net/url_request/url_fetcher_core.cc

Index: net/url_request/url_fetcher_core.cc
diff --git a/net/url_request/url_fetcher_core.cc b/net/url_request/url_fetcher_core.cc
index 420e83147b48c09c24c5967edef462a7357cef0d..c9f028f7be5752f3c58f8201d96c00d27212c0b4 100644
--- a/net/url_request/url_fetcher_core.cc
+++ b/net/url_request/url_fetcher_core.cc
@@ -931,7 +931,18 @@ void URLFetcherCore::InformDelegateUploadProgressInDelegateThread(
 }
 
 void URLFetcherCore::InformDelegateDownloadProgress() {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
+  tracked_objects::ScopedTracker tracking_profile1(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "423948 URLFetcherCore::InformDelegateDownloadProgress1"));
+
   DCHECK(network_task_runner_->BelongsToCurrentThread());
+
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
+  tracked_objects::ScopedTracker tracking_profile2(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "423948 URLFetcherCore::InformDelegateDownloadProgress2"));
+
   delegate_task_runner_->PostTask(
       FROM_HERE,
       base::Bind(