IndexedDB: Remove ASSERTs that can't assert but result in compiler warnings
https://bugs.webkit.org/show_bug.cgi?id=106442

Patch by Jussi Kukkonen <jussi.kukkonen@intel.com> on 2013-01-09
Reviewed by Kentaro Hara.

IDBLevelDBCoding::m_metaDataType has been changed to unsigned
so ASSERT(m_metaDataType >= 0) is no longer useful: the compiler
warnings however create build difficulties at least with EFL.

* Modules/indexeddb/IDBLevelDBCoding.cpp:
(WebCore::IDBLevelDBCoding::ObjectStoreMetaDataKey::metaDataType):
(WebCore::IDBLevelDBCoding::ObjectStoreMetaDataKey::compare):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@139193 268f45cc-cd09-0410-ab3c-d52691b4dbfc