Revert 270016 "Add most of the metadata-handling code for blobs...."

This may have caused indexed_db layout tests to start failing.

> Add most of the metadata-handling code for blobs.  It's not quite all there, but
> this is the biggest chunk I can pull out vaguely cleanly.  It does contain a
> couple of fake calls to keep the compiler happy.
> This CL also makes SetUpMetadata a member in order to ease testing in a later CL.
> 
> This depends on https://codereview.chromium.org/261843004/.
> 
> BUG=108012
> 
> Review URL: https://codereview.chromium.org/266333002

TBR=ericu@chromium.org

Review URL: https://codereview.chromium.org/281623004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@270038 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/indexed_db/indexed_db_backing_store.h

@@ -308,9 +308,7 @@ class CONTENT_EXPORT IndexedDBBackingStore
     virtual bool LoadCurrentRow() = 0;
 
    protected:
-    Cursor(scoped_refptr<IndexedDBBackingStore> backing_store,
-           Transaction* transaction,
-           int64 database_id,
+    Cursor(LevelDBTransaction* transaction,
            const CursorOptions& cursor_options);
     explicit Cursor(const IndexedDBBackingStore::Cursor* other);
 
@@ -321,9 +319,7 @@ class CONTENT_EXPORT IndexedDBBackingStore
     bool IsPastBounds() const;
     bool HaveEnteredRange() const;
 
-    IndexedDBBackingStore* backing_store_;
-    Transaction* transaction_;
-    int64 database_id_;
+    LevelDBTransaction* transaction_;
     const CursorOptions cursor_options_;
     scoped_ptr<LevelDBIterator> iterator_;
     scoped_ptr<IndexedDBKey> current_key_;
@@ -403,11 +399,6 @@ class CONTENT_EXPORT IndexedDBBackingStore
 
     LevelDBTransaction* transaction() { return transaction_; }
 
-    leveldb::Status GetBlobInfoForRecord(
-        int64 database_id,
-        const std::string& object_store_data_key,
-        IndexedDBValue* value);
-
     // This holds a BlobEntryKey and the encoded IndexedDBBlobInfo vector stored
     // under that key.
     typedef std::vector<std::pair<BlobEntryKey, std::string> >
@@ -484,8 +475,6 @@ class CONTENT_EXPORT IndexedDBBackingStore
 
   bool is_incognito() const { return !indexed_db_factory_; }
 
-  bool SetUpMetadata();
-
   virtual bool WriteBlobFile(
       int64 database_id,
       const Transaction::WriteDescriptor& descriptor,

content/browser/indexed_db/indexed_db_leveldb_coding.cc

@@ -46,8 +46,7 @@
 // <0, 0, 0, 2> => SerializedScriptValue version [DataVersionKey]
 // <0, 0, 0, 3>
 //   => Blob journal
-//     The format of the journal is:
-//         {database_id (var int), blobKey (var int)}*.
+//     The format of the journal is: {database_id, blobKey}*.
 //     If the blobKey is kAllBlobsKey, the whole database should be deleted.
 //     [BlobJournalKey]
 // <0, 0, 0, 4> => Live blob journal; same format. [LiveBlobJournalKey]