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

content/browser/loader/resource_requester_info.cc

Index: content/browser/loader/resource_requester_info.cc
diff --git a/content/browser/loader/resource_requester_info.cc b/content/browser/loader/resource_requester_info.cc
index 7b4f1e502475f8e9e8ca3b8ac3c76e671d0d8f00..cc82573e86c38f4fe8bca5a9882882574a604e7f 100644
--- a/content/browser/loader/resource_requester_info.cc
+++ b/content/browser/loader/resource_requester_info.cc
@@ -8,8 +8,8 @@
 #include "base/memory/ptr_util.h"
 #include "content/browser/appcache/chrome_appcache_service.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
+#include "content/browser/loader/loader_globals.h"
 #include "content/browser/service_worker/service_worker_context_wrapper.h"
-#include "content/public/browser/browser_thread.h"
 #include "content/public/browser/resource_context.h"
 #include "content/public/common/browser_side_navigation_policy.h"
 #include "storage/browser/fileapi/file_system_context.h"
@@ -49,7 +49,8 @@ ResourceRequesterInfo::~ResourceRequesterInfo() {}
 
 void ResourceRequesterInfo::set_filter(
     base::WeakPtr<ResourceMessageFilter> filter) {
-  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(
+      LoaderGlobals::Get()->io_thread_task_runner()->BelongsToCurrentThread());

[jam, 2017/03/29 15:44:33]

i think we can take this out, there's one caller inside content and that one
already checks its thread (and it's somewhat redundant anyways)

[ananta, 2017/03/29 19:41:04]

Done.

   DCHECK_EQ(RequesterType::RENDERER, type_);
   filter_ = filter;
 }