Revert of [Blob] BlobReader class & tests, and removal of all redundant reading.

storage/browser/blob/blob_url_request_job_factory.h

Index: storage/browser/blob/blob_url_request_job_factory.h
diff --git a/storage/browser/blob/blob_url_request_job_factory.h b/storage/browser/blob/blob_url_request_job_factory.h
index dcb2fd6784b27baa88d59cdd3585aa6240d35747..7f7a5506447ad7eb617d9aaa5c11fef9c9a37a1d 100644
--- a/storage/browser/blob/blob_url_request_job_factory.h
+++ b/storage/browser/blob/blob_url_request_job_factory.h
@@ -26,6 +26,7 @@
 
 namespace storage {
 
+class BlobDataSnapshot;
 class BlobDataHandle;
 class BlobStorageContext;
 
@@ -44,9 +45,6 @@
       net::URLRequest* request,
       scoped_ptr<BlobDataHandle> blob_data_handle);
 
-  // This gets the handle on the request if it exists.
-  static BlobDataHandle* GetRequestBlobDataHandle(net::URLRequest* request);
-
   BlobProtocolHandler(
       BlobStorageContext* context,
       storage::FileSystemContext* file_system_context,
@@ -58,7 +56,7 @@
       net::NetworkDelegate* network_delegate) const override;
 
  private:
-  BlobDataHandle* LookupBlobHandle(net::URLRequest* request) const;
+  scoped_ptr<BlobDataSnapshot> LookupBlobData(net::URLRequest* request) const;
 
   base::WeakPtr<BlobStorageContext> context_;
   const scoped_refptr<storage::FileSystemContext> file_system_context_;