(2nd try) Add a helper class that keeps per-profile information for FileSystem API

chrome/browser/profile.cc

 // Copyright (c) 2010 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/profile.h"
 
 #include "app/resource_bundle.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_ptr.h"
 #include "base/string_util.h"
 #include "chrome/browser/background_contents_service.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_blob_storage_context.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/download/download_manager.h"
+#include "chrome/browser/file_system/file_system_host_context.h"
 #include "chrome/browser/find_bar_state.h"
 #include "chrome/browser/in_process_webkit/webkit_context.h"
 #include "chrome/browser/net/chrome_url_request_context.h"
 #include "chrome/browser/notifications/desktop_notification_service.h"
 #include "chrome/browser/ssl/ssl_host_state.h"
 #include "chrome/browser/sync/profile_sync_service.h"
 #include "chrome/browser/themes/browser_theme_provider.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
@@ skipping 277 matching lines @@
   }
 
   virtual bool HasCreatedDownloadManager() const {
     return (download_manager_.get() != NULL);
   }
 
   virtual PersonalDataManager* GetPersonalDataManager() {
     return NULL;
   }
 
+  virtual FileSystemHostContext* GetFileSystemHostContext() {
+    if (!file_system_host_context_)
+      file_system_host_context_ = new FileSystemHostContext(
+          GetPath(), IsOffTheRecord());
+    DCHECK(file_system_host_context_.get());
+    return file_system_host_context_.get();
+  }
+
   virtual void InitThemes() {
     profile_->InitThemes();
   }
 
   virtual void SetTheme(Extension* extension) {
     profile_->SetTheme(extension);
   }
 
   virtual void SetNativeTheme() {
     profile_->SetNativeTheme();
@@ skipping 247 matching lines @@
   // Should be used only on the file thread.
   scoped_refptr<webkit_database::DatabaseTracker> db_tracker_;
 
   FilePath last_selected_directory_;
 
   // Tracks all BackgroundContents running under this profile.
   scoped_ptr<BackgroundContentsService> background_contents_service_;
 
   scoped_refptr<ChromeBlobStorageContext> blob_storage_context_;
 
+  // The file_system context for this profile.
+  scoped_refptr<FileSystemHostContext> file_system_host_context_;
+
   DISALLOW_COPY_AND_ASSIGN(OffTheRecordProfileImpl);
 };
 
 Profile *Profile::CreateOffTheRecordProfile() {
   return new OffTheRecordProfileImpl(this);
 }