Pass FROM_HERE to ObserverListThreadSafe::Notify to improve profile.

chrome/browser/extensions/api/storage/syncable_settings_storage.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 "chrome/browser/extensions/api/storage/syncable_settings_storage.h"
 
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/extensions/api/storage/settings_sync_processor.h"
 #include "chrome/browser/extensions/api/storage/settings_sync_util.h"
 #include "content/public/browser/browser_thread.h"
@@ skipping 338 matching lines @@
         NOTREACHED();
     }
 
     if (error.IsSet()) {
       errors.push_back(error);
     }
   }
 
   sync_processor_->NotifyChanges(changes);
 
-  observers_->Notify(
-      &SettingsObserver::OnSettingsChanged,
-      extension_id_,
-      settings_namespace::SYNC,
-      ValueStoreChange::ToJson(changes));
+  observers_->Notify(FROM_HERE, &SettingsObserver::OnSettingsChanged,
+                     extension_id_, settings_namespace::SYNC,
+                     ValueStoreChange::ToJson(changes));
 
   // TODO(kalman): Something sensible with multiple errors.
   return errors.empty() ? syncer::SyncError() : errors[0];
 }
 
 syncer::SyncError SyncableSettingsStorage::OnSyncAdd(
     const std::string& key,
     base::Value* new_value,
     ValueStoreChangeList* changes) {
   DCHECK(new_value);
@@ skipping 42 matching lines @@
         syncer::SyncError::DATATYPE_ERROR,
         base::StringPrintf("Error pushing sync remove to local settings: %s",
             result->error().message.c_str()),
         sync_processor_->type());
   }
   changes->push_back(ValueStoreChange(key, old_value, NULL));
   return syncer::SyncError();
 }
 
 }  // namespace extensions