Don't delete leveldb directory if disk was full.

content/browser/indexed_db/indexed_db_backing_store.cc

Index: content/browser/indexed_db/indexed_db_backing_store.cc
diff --git a/content/browser/indexed_db/indexed_db_backing_store.cc b/content/browser/indexed_db/indexed_db_backing_store.cc
index ccd6bf827fb43b8a2f4dd27f12064371f2286a19..5933fea9cc89accf02be813430e123519bbcecd6 100644
--- a/content/browser/indexed_db/indexed_db_backing_store.cc
+++ b/content/browser/indexed_db/indexed_db_backing_store.cc
@@ -365,8 +365,8 @@ class DefaultLevelDBFactory : public LevelDBFactory {
  public:
   virtual scoped_ptr<LevelDBDatabase> OpenLevelDB(
       const base::FilePath& file_name,
-      const LevelDBComparator* comparator) OVERRIDE {
-    return LevelDBDatabase::Open(file_name, comparator);
+      const LevelDBComparator* comparator, bool* is_disk_full) OVERRIDE {
+    return LevelDBDatabase::Open(file_name, comparator, is_disk_full);
   }
   virtual bool DestroyLevelDB(const base::FilePath& file_name) OVERRIDE {
     return LevelDBDatabase::Destroy(file_name);
@@ -499,7 +499,8 @@ scoped_refptr<IndexedDBBackingStore> IndexedDBBackingStore::Open(
 
   base::FilePath file_path = path_base.Append(identifier_path);
 
-  db = leveldb_factory->OpenLevelDB(file_path, comparator.get());
+  bool is_disk_full = false;

[jsbell, 2013/06/07 17:48:41]

This isn't used. In the Blink patch we assert, log, histogram and fail the open
so that we don't fall into the failure code.

[dgrogan, 2013/06/07 18:23:58]

Thanks for catching this. I decided the blink behavior isn't exactly right. In
blink, even if the database was successfully opened we'd throw an error if the
disk was full. I'd rather it be such that if the database is successfully opened
and read we return success even if the disk is full. Who knows, some space may
have been freed between checking and opening.

The important part is not deleting data when the disk is full.

+  db = leveldb_factory->OpenLevelDB(file_path, comparator.get(), &is_disk_full);
 
   if (db) {
     bool known = false;