Remove unnecessary instrumentation for several jank bugs.

net/http/partial_data.cc

Index: net/http/partial_data.cc
diff --git a/net/http/partial_data.cc b/net/http/partial_data.cc
index f0615d5ac335b4d42bdbdc8a188d417a07e6733a..2dcb015bea69a561006039bc180505d89ce46afe 100644
--- a/net/http/partial_data.cc
+++ b/net/http/partial_data.cc
@@ -8,7 +8,6 @@
 #include "base/bind_helpers.h"
 #include "base/format_macros.h"
 #include "base/logging.h"
-#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ -90,11 +89,6 @@ int PartialData::Core::GetAvailableRange(disk_cache::Entry* entry, int64 offset,
 }
 
 void PartialData::Core::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 PartialData::Core::OnIOComplete"));
-
   if (owner_)
     owner_->GetAvailableRangeCompleted(result, start_);
   delete this;