[BlackBerry] Credential backing store implementation

[BlackBerry] Credential backing store implementation
https://bugs.webkit.org/show_bug.cgi?id=76761

Patch by Jonathan Dong <jonathan.dong@torchmobile.com.cn> on 2012-01-30
Reviewed by Antonio Gomes.

Implemented credential backing store database and related
operations in class CredentialBackingStore.

* platform/network/blackberry/CredentialBackingStore.cpp:
(WebCore::CredentialBackingStore::~CredentialBackingStore):
(WebCore::CredentialBackingStore::open):
(WebCore::CredentialBackingStore::close):
(WebCore::CredentialBackingStore::addLogin):
(WebCore::CredentialBackingStore::updateLogin):
(WebCore::CredentialBackingStore::hasLogin):
(WebCore::CredentialBackingStore::getLogin):
(WebCore::CredentialBackingStore::removeLogin):
(WebCore::CredentialBackingStore::clear):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@106234 268f45cc-cd09-0410-ab3c-d52691b4dbfc