Reduce/remove usage of BrowserThread in content/browser/loader.

content/browser/loader/resource_request_info_impl.cc

Index: content/browser/loader/resource_request_info_impl.cc
diff --git a/content/browser/loader/resource_request_info_impl.cc b/content/browser/loader/resource_request_info_impl.cc
index 2f4ffd4f1139ac64d036e6e92f18eb8e8bc1caa2..edab51de7deead88ec6591f487d6dcbaf3c96126 100644
--- a/content/browser/loader/resource_request_info_impl.cc
+++ b/content/browser/loader/resource_request_info_impl.cc
@@ -6,11 +6,11 @@
 
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/loader/global_routing_id.h"
+#include "content/browser/loader/loader_globals.h"
 #include "content/browser/loader/resource_message_filter.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/net/url_request_service_worker_data.h"
 #include "content/common/net/url_request_user_data.h"
-#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/global_request_id.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "content/public/common/process_type.h"
@@ -21,7 +21,9 @@ namespace content {
 namespace {
 
 WebContents* GetWebContentsFromFTNID(int frame_tree_node_id) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  DCHECK(LoaderGlobals::Get()
+             ->main_thread_task_runner()
+             ->BelongsToCurrentThread());
   FrameTreeNode* frame_tree_node =
       FrameTreeNode::GloballyFindByID(frame_tree_node_id);
   if (!frame_tree_node)