Update callers of CreateFileSystemOperation so more detailed error codes can be returned. Where app…

webkit/fileapi/file_system_file_stream_reader.cc

Index: webkit/fileapi/file_system_file_stream_reader.cc
diff --git a/webkit/fileapi/file_system_file_stream_reader.cc b/webkit/fileapi/file_system_file_stream_reader.cc
index d1e52205460575e7d827e93cd38a2468d3f964ea..ef0a9154f1401dd1b81d9adaed7f8f4c761af3f5 100644
--- a/webkit/fileapi/file_system_file_stream_reader.cc
+++ b/webkit/fileapi/file_system_file_stream_reader.cc
@@ -53,10 +53,11 @@ int FileSystemFileStreamReader::Read(
   if (local_file_reader_.get())
     return local_file_reader_->Read(buf, buf_len, callback);
   DCHECK(!has_pending_create_snapshot_);
+  base::PlatformFileError error_code;
   FileSystemOperation* operation =
-      file_system_context_->CreateFileSystemOperation(url_);
-  if (!operation)
-    return net::ERR_INVALID_URL;
+      file_system_context_->CreateFileSystemOperation(url_, &error_code);
+  if (error_code != base::PLATFORM_FILE_OK)
+    return net::PlatformFileErrorToNetError(error_code);
   has_pending_create_snapshot_ = true;
   operation->CreateSnapshotFile(
       url_,