Fail when uploading blob is non-existant

content/browser/blob_storage/chrome_blob_storage_context.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/files/file.h"
@@ skipping 179 matching lines @@
   delete this;
 }
 
 storage::BlobStorageContext* GetBlobStorageContext(
     ChromeBlobStorageContext* blob_storage_context) {
   if (!blob_storage_context)
     return NULL;
   return blob_storage_context->context();
 }
 
-void AttachRequestBodyBlobDataHandles(ResourceRequestBodyImpl* body,
+bool AttachRequestBodyBlobDataHandles(ResourceRequestBodyImpl* body,
                                       ResourceContext* resource_context) {
   storage::BlobStorageContext* blob_context = GetBlobStorageContext(
       GetChromeBlobStorageContextForResourceContext(resource_context));
 
   DCHECK(blob_context);
   for (size_t i = 0; i < body->elements()->size(); ++i) {
     const ResourceRequestBodyImpl::Element& element = (*body->elements())[i];
     if (element.type() != ResourceRequestBodyImpl::Element::TYPE_BLOB)
       continue;
     std::unique_ptr<storage::BlobDataHandle> handle =
         blob_context->GetBlobDataFromUUID(element.blob_uuid());
-    DCHECK(handle);
     if (!handle)
-      continue;
+      return false;
     // Ensure the blob and any attached shareable files survive until
     // upload completion. The |body| takes ownership of |handle|.
     const void* key = handle.get();
     body->SetUserData(key, std::move(handle));
   }
+  return true;
 }
 
 }  // namespace content