Remove sync OnTransaction{Start,End} notification

chrome/browser/sync/syncable/syncable.cc

 // Copyright (c) 2011 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/sync/syncable/syncable.h"
 
 #include <algorithm>
 #include <cstring>
 #include <functional>
 #include <iomanip>
@@ skipping 1177 matching lines @@
 
 BaseTransaction::BaseTransaction(const tracked_objects::Location& from_here,
                                  const char* name,
                                  WriterTag writer,
                                  Directory* directory)
     : from_here_(from_here), name_(name), writer_(writer),
       directory_(directory), dirkernel_(directory->kernel_) {
   TRACE_EVENT_BEGIN2("sync", name_,
                      "src_file", from_here_.file_name(),
                      "src_func", from_here_.function_name());
-  dirkernel_->transaction_observer.Call(FROM_HERE,
-      &TransactionObserver::OnTransactionStart, from_here_, writer_);
 }
 
 BaseTransaction::~BaseTransaction() {
-  if (writer_ != INVALID) {
-    dirkernel_->transaction_observer.Call(FROM_HERE,
-        &TransactionObserver::OnTransactionEnd, from_here_, writer_);
-  }
   TRACE_EVENT_END0("sync", name_);
 }
 
 ReadTransaction::ReadTransaction(const tracked_objects::Location& location,
                                  Directory* directory)
     : BaseTransaction(location, "ReadTransaction", INVALID, directory) {
   Lock();
 }
 
 ReadTransaction::ReadTransaction(const tracked_objects::Location& location,
@@ skipping 849 matching lines @@
     if (entry->ref(NEXT_ID).IsRoot() ||
         entry->ref(NEXT_ID) != entry->ref(PREV_ID)) {
       return entry;
     }
   }
   // There were no children in the linked list.
   return NULL;
 }
 
 }  // namespace syncable