Remove unused fields found by clang's new Wunused-private-fields.

chrome/browser/mock_browsing_data_database_helper.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/mock_browsing_data_database_helper.h"
 
 #include "base/callback.h"
 
 MockBrowsingDataDatabaseHelper::MockBrowsingDataDatabaseHelper(
     Profile* profile)
-    : BrowsingDataDatabaseHelper(profile),
-      profile_(profile) {
+    : BrowsingDataDatabaseHelper(profile) {
 }
 
 MockBrowsingDataDatabaseHelper::~MockBrowsingDataDatabaseHelper() {
 }
 
 void MockBrowsingDataDatabaseHelper::StartFetching(
     const base::Callback<void(const std::list<DatabaseInfo>&)>& callback) {
   callback_ = callback;
 }
 
@@ skipping 29 matching lines @@
     i->second = true;
 }
 
 bool MockBrowsingDataDatabaseHelper::AllDeleted() {
   for (std::map<const std::string, bool>::const_iterator i = databases_.begin();
        i != databases_.end(); ++i)
     if (i->second)
       return false;
   return true;
 }