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

chrome/browser/mock_browsing_data_file_system_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 "base/callback.h"
 #include "base/logging.h"
 #include "chrome/browser/mock_browsing_data_file_system_helper.h"
 
 MockBrowsingDataFileSystemHelper::MockBrowsingDataFileSystemHelper(
-    Profile* profile)
-    : profile_(profile) {
+    Profile* profile) {
 }
 
 MockBrowsingDataFileSystemHelper::~MockBrowsingDataFileSystemHelper() {
 }
 
 void MockBrowsingDataFileSystemHelper::StartFetching(
     const base::Callback<void(const std::list<FileSystemInfo>&)>& callback) {
   callback_ = callback;
 }
 
@@ skipping 31 matching lines @@
 
 bool MockBrowsingDataFileSystemHelper::AllDeleted() {
   for (std::map<const std::string, bool>::const_iterator i =
             file_systems_.begin();
        i != file_systems_.end(); ++i) {
     if (i->second)
       return false;
   }
   return true;
 }