Remove unnecessary instrumentation for several jank bugs.

content/browser/appcache/appcache_response.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 "content/browser/appcache/appcache_response.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/logging.h"
@@ skipping 109 matching lines @@
   DCHECK(entry_);
   int rv = entry_->Write(
       index, offset, buf, buf_len,
       base::Bind(&AppCacheResponseIO::OnRawIOComplete,
                  weak_factory_.GetWeakPtr()));
   if (rv != net::ERR_IO_PENDING)
     ScheduleIOCompletionCallback(rv);
 }
 
 void AppCacheResponseIO::OnRawIOComplete(int result) {
-  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  // TODO(rtenneti): Remove ScopedTracker below once crbug.com/422516 is fixed.
   tracked_objects::ScopedTracker tracking_profile(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "422516 AppCacheResponseIO::OnRawIOComplete"));
 
   DCHECK_NE(net::ERR_IO_PENDING, result);
   OnIOComplete(result);
 }
 
 void AppCacheResponseIO::OpenEntryIfNeeded() {
   int rv;
@@ skipping 333 matching lines @@
   }
   WriteRaw(kResponseMetadataIndex, 0, buffer_.get(), write_amount_);
 }
 
 void AppCacheResponseMetadataWriter::OnIOComplete(int result) {
   DCHECK(result < 0 || write_amount_ == result);
   InvokeUserCompletionCallback(result);
 }
 
 }  // namespace content