Fix some includes in CopyOrMoveFileValidator code.

webkit/fileapi/copy_or_move_file_validator.h

Index: webkit/fileapi/copy_or_move_file_validator.h
diff --git a/webkit/fileapi/copy_or_move_file_validator.h b/webkit/fileapi/copy_or_move_file_validator.h
index a3e4a42a468084873366365fef707942a37ecabe..39b171a80d8ecfcd6db41324afe2a222df87a2ac 100644
--- a/webkit/fileapi/copy_or_move_file_validator.h
+++ b/webkit/fileapi/copy_or_move_file_validator.h
@@ -6,11 +6,16 @@
 #define WEBKIT_FILEAPI_COPY_OR_MOVE_FILE_VALIDATOR_H_
 
 #include "base/callback.h"
-#include "base/files/file_path.h"
 #include "base/platform_file.h"
 
+namespace base {
+class FilePath;
+}
+
 namespace fileapi {
 
+class FileSystemURL;
+
 class CopyOrMoveFileValidator {
  public:
   // Callback that is invoked when validation completes. A result of