FileSystem: Move SnapshotFileCallback into FileSystemCallbacks.h

Source/modules/filesystem/FileSystemCallbacks.h

Index: Source/modules/filesystem/FileSystemCallbacks.h
diff --git a/Source/modules/filesystem/FileSystemCallbacks.h b/Source/modules/filesystem/FileSystemCallbacks.h
index 2bda769fba1624d9b4d111632ffa7d8ab01e141f..053087895edd5369093b9290fbd84a2b0e31e54d 100644
--- a/Source/modules/filesystem/FileSystemCallbacks.h
+++ b/Source/modules/filesystem/FileSystemCallbacks.h
@@ -44,6 +44,7 @@ class DirectoryReaderBase;
 class EntriesCallback;
 class EntryCallback;
 class ErrorCallback;
+class FileCallback;
 struct FileMetadata;
 class FileSystemCallback;
 class FileWriterBase;
@@ -150,6 +151,18 @@ private:
     OwnPtr<FileWriterBaseCallback> m_successCallback;
 };
 
+class SnapshotFileCallback FINAL : public FileSystemCallbacksBase {
+public:
+    static PassOwnPtr<AsyncFileSystemCallbacks> create(DOMFileSystemBase*, const String& name, const KURL&, PassOwnPtr<FileCallback>, PassOwnPtr<ErrorCallback>, ExecutionContext*);
+    virtual void didCreateSnapshotFile(const FileMetadata&, PassRefPtr<BlobDataHandle> snapshot);
+
+private:
+    SnapshotFileCallback(DOMFileSystemBase*, const String& name, const KURL&, PassOwnPtr<FileCallback>, PassOwnPtr<ErrorCallback>, ExecutionContext*);
+    String m_name;
+    KURL m_url;
+    OwnPtr<FileCallback> m_successCallback;
+};
+
 class VoidCallbacks FINAL : public FileSystemCallbacksBase {
 public:
     static PassOwnPtr<AsyncFileSystemCallbacks> create(PassOwnPtr<VoidCallback>, PassOwnPtr<ErrorCallback>, ExecutionContext*, DOMFileSystemBase*);