Allow offsets in blobs larger than 2GB on 32 bit Chromium builds.

storage/browser/blob/blob_storage_context.h

Index: storage/browser/blob/blob_storage_context.h
diff --git a/storage/browser/blob/blob_storage_context.h b/storage/browser/blob/blob_storage_context.h
index 175e900200e321c8d846b9c37c3424f7c479973e..cf73c8a28f881e0bc0c7d13c5720d1550a27e4ad 100644
--- a/storage/browser/blob/blob_storage_context.h
+++ b/storage/browser/blob/blob_storage_context.h
@@ -122,8 +122,8 @@ class STORAGE_EXPORT BlobStorageContext
   // have to split an item.
   bool AppendBlob(const std::string& target_blob_uuid,
                   const InternalBlobData& blob,
-                  size_t offset,
-                  size_t length,
+                  uint64_t offset,
+                  uint64_t length,
                   InternalBlobData::Builder* target_blob_data);
 
   bool IsInUse(const std::string& uuid);