Change the FileUtilProxy callbacks to report error codes instead of booleans....

base/file_util_proxy.h

Index: base/file_util_proxy.h
===================================================================
--- base/file_util_proxy.h	(revision 56938)
+++ base/file_util_proxy.h	(working copy)
@@ -17,40 +17,40 @@
 // This class provides asynchronous access to common file routines.
 class FileUtilProxy {
  public:
-  // This callback is used by methods that report success with a bool.  It is
+  // This callback is used by methods that report only an error code.  It is
   // valid to pass NULL as the callback parameter to any function that takes a
   // StatusCallback, in which case the operation will complete silently.
-  typedef Callback1<bool /* succeeded */>::Type StatusCallback;
+  typedef Callback1<int /* error code */>::Type StatusCallback;
 
   // Creates or opens a file with the given flags.  It is invalid to pass NULL
   // for the callback.
-  typedef Callback2<base::PassPlatformFile, bool /* created */>::Type
-      CreateOrOpenCallback;
-  static void CreateOrOpen(scoped_refptr<MessageLoopProxy> message_loop_proxy,
+  typedef Callback3<int /* error code */, base::PassPlatformFile,
+                    bool /* created */>::Type CreateOrOpenCallback;
+  static bool CreateOrOpen(scoped_refptr<MessageLoopProxy> message_loop_proxy,
                            const FilePath& file_path,
                            int file_flags,
                            CreateOrOpenCallback* callback);
 
   // Creates a temporary file for writing.  The path and an open file handle
   // are returned.  It is invalid to pass NULL for the callback.
-  typedef Callback2<base::PassPlatformFile, FilePath>::Type
-      CreateTemporaryCallback;
-  static void CreateTemporary(
+  typedef Callback3<int /* error code */, base::PassPlatformFile,
+                    FilePath>::Type CreateTemporaryCallback;
+  static bool CreateTemporary(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
       CreateTemporaryCallback* callback);
 
   // Close the given file handle.
-  static void Close(scoped_refptr<MessageLoopProxy> message_loop_proxy,
+  static bool Close(scoped_refptr<MessageLoopProxy> message_loop_proxy,
                     base::PlatformFile,
                     StatusCallback* callback);
 
   // Deletes a file or empty directory.
-  static void Delete(scoped_refptr<MessageLoopProxy> message_loop_proxy,
+  static bool Delete(scoped_refptr<MessageLoopProxy> message_loop_proxy,
                      const FilePath& file_path,
                      StatusCallback* callback);
 
   // Deletes a directory and all of its contents.
-  static void RecursiveDelete(
+  static bool RecursiveDelete(
       scoped_refptr<MessageLoopProxy> message_loop_proxy,
       const FilePath& file_path,
       StatusCallback* callback);