Move SafeBrowsing trace events to the loader category

chrome/browser/renderer_host/safe_browsing_resource_throttle.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/renderer_host/safe_browsing_resource_throttle.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 304 matching lines @@
     threat_type_ = safe_browsing::SB_THREAT_TYPE_SAFE;
     if (defer_state_ != DEFERRED_NONE) {
       ResumeRequest();
     }
   } else {
     controller()->Cancel();
   }
 }
 
 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
   // resource types.
   if (!database_manager_->CanCheckResourceType(resource_type_)) {
     UMA_HISTOGRAM_ENUMERATION("SB2.ResourceTypes2.Skipped", resource_type_,
                               content::RESOURCE_TYPE_LAST_TYPE);
     return true;
   }
 
@@ skipping 47 matching lines @@
                        unchecked_redirect_url_, "defer_reason",
                        "resumed_redirect");
     }
   }
 
   if (resume) {
     defer_state_ = DEFERRED_NONE;
     controller()->Resume();
   }
 }