[BlobAsync] Moving async handling into BlobStorageContext & quota out.

storage/browser/blob/shareable_blob_data_item.cc

Index: storage/browser/blob/shareable_blob_data_item.cc
diff --git a/storage/browser/blob/shareable_blob_data_item.cc b/storage/browser/blob/shareable_blob_data_item.cc
index d085e5a705b8ab79540786c35ea26a71ce38dc6c..2b32349085afd9650b51ed77ae5d9cedf2ed9f90 100644
--- a/storage/browser/blob/shareable_blob_data_item.cc
+++ b/storage/browser/blob/shareable_blob_data_item.cc
@@ -17,12 +17,10 @@ uint64_t GetAndIncrementItemId() {
 }  // namespace
 
 ShareableBlobDataItem::ShareableBlobDataItem(
-    const std::string& referencing_blob_uuid,
     scoped_refptr<BlobDataItem> item,
     ShareableBlobDataItem::State state)
     : item_id_(GetAndIncrementItemId()), state_(state), item_(std::move(item)) {
   DCHECK_NE(item_->type(), DataElement::TYPE_BLOB);
-  referencing_blobs_.insert(referencing_blob_uuid);
 }
 
 ShareableBlobDataItem::~ShareableBlobDataItem() {
@@ -36,17 +34,12 @@ void PrintTo(const ShareableBlobDataItem& x, ::std::ostream* os) {
   *os << "<ShareableBlobDataItem>{ item_id: " << x.item_id_
       << ", state: " << x.state_ << ", item: ";
   PrintTo(*x.item_, os);
-  *os << ", referencing_blobs: [";
-  for (const std::string& uuid : x.referencing_blobs()) {
-    *os << uuid << ", ";
-  }
   *os << "]}";
 }
 
 bool operator==(const ShareableBlobDataItem& a,
                 const ShareableBlobDataItem& b) {
-  return a.item_id() == b.item_id() && *a.item() == *b.item() &&
-         a.referencing_blobs() == b.referencing_blobs();
+  return a.item_id() == b.item_id() && *a.item() == *b.item();
 }
 
 bool operator!=(const ShareableBlobDataItem& a,