Revert of [Blob] Fix for resetting reader.

storage/browser/blob/upload_blob_element_reader.cc

Index: storage/browser/blob/upload_blob_element_reader.cc
diff --git a/storage/browser/blob/upload_blob_element_reader.cc b/storage/browser/blob/upload_blob_element_reader.cc
index e4d6d4a591da4caaf8d0bcfcd875f1c16589fbf5..dd0058f3617e68b6330791469118980c03e71d0c 100644
--- a/storage/browser/blob/upload_blob_element_reader.cc
+++ b/storage/browser/blob/upload_blob_element_reader.cc
@@ -4,27 +4,20 @@
 
 #include "storage/browser/blob/upload_blob_element_reader.h"
 
-#include "base/single_thread_task_runner.h"
 #include "net/base/net_errors.h"
 #include "storage/browser/blob/blob_data_handle.h"
 #include "storage/browser/blob/blob_reader.h"
-#include "storage/browser/fileapi/file_system_context.h"
 
 namespace storage {
 
 UploadBlobElementReader::UploadBlobElementReader(
-    scoped_ptr<BlobDataHandle> handle,
-    FileSystemContext* file_system_context,
-    base::SingleThreadTaskRunner* file_task_runner)
-    : handle_(handle.Pass()),
-      file_system_context_(file_system_context),
-      file_runner_(file_task_runner) {}
+    scoped_ptr<storage::BlobReader> reader,
+    scoped_ptr<BlobDataHandle> handle)
+    : reader_(reader.Pass()), handle_(handle.Pass()) {}
 
 UploadBlobElementReader::~UploadBlobElementReader() {}
 
 int UploadBlobElementReader::Init(const net::CompletionCallback& callback) {
-  reader_ =
-      handle_->CreateReader(file_system_context_.get(), file_runner_.get());
   BlobReader::Status status = reader_->CalculateSize(callback);
   switch (status) {
     case BlobReader::Status::NET_ERROR: