Hook up DomStorageArea with a DomStorageDatabase.

webkit/dom_storage/dom_storage_database.cc

Index: webkit/dom_storage/dom_storage_database.cc
diff --git a/webkit/dom_storage/dom_storage_database.cc b/webkit/dom_storage/dom_storage_database.cc
index 673ddde5380433e9b6d246b2799765cbef82a548..53adbc670a1cb74c1b085bb5f6bd98218cd274fc 100644
--- a/webkit/dom_storage/dom_storage_database.cc
+++ b/webkit/dom_storage/dom_storage_database.cc
@@ -40,6 +40,16 @@ DomStorageDatabase::DomStorageDatabase(const FilePath& file_path)
 }
 
 DomStorageDatabase::~DomStorageDatabase() {
+  if (IsOpen()) {
+    sql::Statement statement(db_->GetCachedStatement(SQL_FROM_HERE,
+        "SELECT COUNT(key) from ItemTable"));

[michaeln, 2012/02/23 20:48:48]

like we chatted about, can the 'its empty' condition be determined w/o incurring
disk io at dtor time... probably worth some extra statefullness in this class to
avoid many small bits of io at browser shutdown

[benm (inactive), 2012/02/24 12:42:01]

Done, but moved to it's own CL in http://codereview.chromium.org/9467003/

+    if (statement.Step() && statement.ColumnInt(0) == 0) {
+      // Delete the db from disk, it's empty.
+      statement.Clear();
+      Close();
+      file_util::Delete(file_path_, false);
+    }
+  }
 }
 
 void DomStorageDatabase::ReadAllValues(ValuesMap* result) {