Remove unnecessary instrumentation for several jank bugs.

net/disk_cache/cache_creator.cc

Index: net/disk_cache/cache_creator.cc
diff --git a/net/disk_cache/cache_creator.cc b/net/disk_cache/cache_creator.cc
index 93c06b3232df511a7a1eb9d50d536e883015a67b..8c4400c2f23c7b48ccc15897da80f42e5e91f51e 100644
--- a/net/disk_cache/cache_creator.cc
+++ b/net/disk_cache/cache_creator.cc
@@ -4,7 +4,6 @@
 
 #include "base/files/file_path.h"
 #include "base/metrics/field_trial.h"
-#include "base/profiler/scoped_tracker.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "net/base/cache_type.h"
@@ -140,10 +139,6 @@ void CacheCreator::DoCallback(int result) {
 // If the initialization of the cache fails, and |force| is true, we will
 // discard the whole cache and create a new one.
 void CacheCreator::OnIOComplete(int result) {
-  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
-  tracked_objects::ScopedTracker tracking_profile(
-      FROM_HERE_WITH_EXPLICIT_FUNCTION("422516 CacheCreator::OnIOComplete"));
-
   if (result == net::OK || !force_ || retry_)
     return DoCallback(result);