IndexedDB: Implement IPC plumbing for IDBObjectStore.delete(IDBKeyRange)

Introduces an IndexedDBKeyRange type for simplifying IPC messages, but existing messages have not yet been changed to use it.

BUG=101384
TEST=


Review URL: http://codereview.chromium.org/9389025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@122567 0039d316-1c4b-4281-b951-d872f2087c98
12 files changed