Move SafeBrowsing trace events to the loader category

chrome/browser/renderer_host/safe_browsing_resource_throttle.cc

Index: chrome/browser/renderer_host/safe_browsing_resource_throttle.cc
diff --git a/chrome/browser/renderer_host/safe_browsing_resource_throttle.cc b/chrome/browser/renderer_host/safe_browsing_resource_throttle.cc
index 2247d175039d3850755a7e39c98ab9cd636f09e8..9ed2c9591a0b4da595ac0a4462b3b4dd77fdac5c 100644
--- a/chrome/browser/renderer_host/safe_browsing_resource_throttle.cc
+++ b/chrome/browser/renderer_host/safe_browsing_resource_throttle.cc
@@ -322,7 +322,7 @@ void SafeBrowsingResourceThrottle::OnBlockingPageComplete(bool proceed) {
 }
 
 bool SafeBrowsingResourceThrottle::CheckUrl(const GURL& url) {
-  TRACE_EVENT1("SafeBrowsing", "SafeBrowsingResourceThrottle::CheckUrl", "url",
+  TRACE_EVENT1("loader", "SafeBrowsingResourceThrottle::CheckUrl", "url",
                url.spec());
   CHECK_EQ(state_, STATE_NONE);
   // To reduce aggregate latency on mobile, check only the most dangerous