Remove unnecessary instrumentation for several jank bugs.

content/browser/appcache/appcache_update_job.cc

Index: content/browser/appcache/appcache_update_job.cc
diff --git a/content/browser/appcache/appcache_update_job.cc b/content/browser/appcache/appcache_update_job.cc
index f36a2ecd634260c89a772c1b212d41512c3f7614..b5d29a974380313c6e4d7cf3d16a0b1b7edc44e1 100644
--- a/content/browser/appcache/appcache_update_job.cc
+++ b/content/browser/appcache/appcache_update_job.cc
@@ -8,7 +8,6 @@
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
-#include "base/profiler/scoped_tracker.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "content/browser/appcache/appcache_group.h"
@@ -153,11 +152,6 @@ void AppCacheUpdateJob::URLFetcher::OnReceivedRedirect(
 
 void AppCacheUpdateJob::URLFetcher::OnResponseStarted(
     net::URLRequest *request) {
-  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
-  tracked_objects::ScopedTracker tracking_profile(
-      FROM_HERE_WITH_EXPLICIT_FUNCTION(
-          "422516 AppCacheUpdateJob::URLFetcher::OnResponseStarted"));
-
   DCHECK(request == request_);
   int response_code = -1;
   if (request->status().is_success()) {
@@ -217,11 +211,6 @@ void AppCacheUpdateJob::URLFetcher::OnResponseStarted(
 
 void AppCacheUpdateJob::URLFetcher::OnReadCompleted(
     net::URLRequest* request, int bytes_read) {
-  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
-  tracked_objects::ScopedTracker tracking_profile(
-      FROM_HERE_WITH_EXPLICIT_FUNCTION(
-          "422516 AppCacheUpdateJob::URLFetcher::OnReadCompleted"));
-
   DCHECK(request_ == request);
   bool data_consumed = true;
   if (request->status().is_success() && bytes_read > 0) {