FileAPI: Add Initialize() function to FileSystemBackend

chrome/browser/chromeos/fileapi/file_system_backend.cc

Index: chrome/browser/chromeos/fileapi/file_system_backend.cc
diff --git a/chrome/browser/chromeos/fileapi/file_system_backend.cc b/chrome/browser/chromeos/fileapi/file_system_backend.cc
index fce5776d72098e9ca22806cd69c245d3a013de13..a259b1a9022df730740cba34093b93a10d1e98a4 100644
--- a/chrome/browser/chromeos/fileapi/file_system_backend.cc
+++ b/chrome/browser/chromeos/fileapi/file_system_backend.cc
@@ -106,12 +106,14 @@ bool FileSystemBackend::CanHandleType(fileapi::FileSystemType type) const {
   }
 }
 
-void FileSystemBackend::InitializeFileSystem(
+void FileSystemBackend::Initialize(fileapi::FileSystemContext* context) {
+}
+
+void FileSystemBackend::OpenFileSystem(
     const GURL& origin_url,
     fileapi::FileSystemType type,
     fileapi::OpenFileSystemMode mode,
-    fileapi::FileSystemContext* context,
-    const InitializeFileSystemCallback& callback) {
+    const OpenFileSystemCallback& callback) {
   DCHECK(fileapi::IsolatedContext::IsIsolatedType(type));
   // Nothing to validate for external filesystem.
   callback.Run(GetFileSystemRootURI(origin_url, type),