DevTools: Do not treat saved path as dot separated keys when saving file systems.

chrome/browser/devtools/devtools_file_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/devtools/devtools_file_helper.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 300 matching lines @@
   }
   std::string registered_name;
   std::string file_system_id = RegisterFileSystem(web_contents_,
                                                   path,
                                                   &registered_name);
   std::string file_system_path = path.AsUTF8Unsafe();
 
   DictionaryPrefUpdate update(profile_->GetPrefs(),
                               prefs::kDevToolsFileSystemPaths);
   DictionaryValue* file_systems_paths_value = update.Get();
-  file_systems_paths_value->Set(file_system_path, Value::CreateNullValue());
+  file_systems_paths_value->SetWithoutPathExpansion(file_system_path,
+                                                    Value::CreateNullValue());
 
   FileSystem filesystem = CreateFileSystemStruct(web_contents_,
                                                  file_system_id,
                                                  registered_name,
                                                  file_system_path);
   callback.Run(filesystem);
 }
 
 void DevToolsFileHelper::RequestFileSystems(
     const RequestFileSystemsCallback& callback) {
@@ skipping 21 matching lines @@
 void DevToolsFileHelper::RemoveFileSystem(const std::string& file_system_path) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   base::FilePath path = base::FilePath::FromUTF8Unsafe(file_system_path);
   isolated_context()->RevokeFileSystemByPath(path);
 
   DictionaryPrefUpdate update(profile_->GetPrefs(),
                               prefs::kDevToolsFileSystemPaths);
   DictionaryValue* file_systems_paths_value = update.Get();
   file_systems_paths_value->RemoveWithoutPathExpansion(file_system_path, NULL);
 }