FileAPI: Clean up around FileSystemBackend

webkit/browser/fileapi/sandbox_file_system_backend.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 "webkit/browser/fileapi/sandbox_file_system_backend.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 76 matching lines @@
 
   virtual bool HasFileSystemType(fileapi::FileSystemType type) const OVERRIDE {
     return enum_->HasFileSystemType(type);
   }
 
  private:
   scoped_ptr<ObfuscatedFileUtil::AbstractOriginEnumerator> enum_;
 };
 
 void DidOpenFileSystem(
-    base::WeakPtr<SandboxFileSystemBackend> mount_point_provider,
+    base::WeakPtr<SandboxFileSystemBackend> sandbox_backend,
     const base::Callback<void(base::PlatformFileError error)>& callback,
     base::PlatformFileError* error) {
-  if (mount_point_provider.get())
-    mount_point_provider.get()->CollectOpenFileSystemMetrics(*error);
+  if (sandbox_backend.get())
+    sandbox_backend.get()->CollectOpenFileSystemMetrics(*error);
   callback.Run(*error);
 }
 
 void OpenFileSystemOnFileThread(
     ObfuscatedFileUtil* file_util,
     const GURL& origin_url,
     FileSystemType type,
     OpenFileSystemMode mode,
     base::PlatformFileError* error_ptr) {
   DCHECK(error_ptr);
@@ skipping 541 matching lines @@
 
   while (!(file_path_each = enumerator->Next()).empty()) {
     usage += enumerator->Size();
     usage += ObfuscatedFileUtil::ComputeFilePathCost(file_path_each);
   }
 
   return usage;
 }
 
 }  // namespace fileapi