IndexedDB: Rename valid/finished methods to isValid/isFinished to match coding standard

IndexedDB: Rename valid/finished methods to isValid/isFinished to match coding standard
https://bugs.webkit.org/show_bug.cgi?id=86655

Reviewed by Tony Chang.

No new tests - no functional changes.

* Modules/indexeddb/IDBKey.h:
(WebCore::IDBKey::isValid): valid() => isValid()
* Modules/indexeddb/IDBObjectStore.cpp:
(WebCore::IDBObjectStore::deleteFunction):
(WebCore::IDBObjectStore::index):
(WebCore::IDBObjectStore::transactionFinished):
* Modules/indexeddb/IDBObjectStoreBackendImpl.cpp:
(WebCore::IDBObjectStoreBackendImpl::put):
(WebCore::IDBObjectStoreBackendImpl::putInternal):
(WebCore::IDBObjectStoreBackendImpl::deleteFunction):
* Modules/indexeddb/IDBRequest.cpp:
(WebCore::IDBRequest::onSuccess):
* Modules/indexeddb/IDBTransaction.cpp:
(WebCore::IDBTransaction::isFinished): finished() => isFinished()
* Modules/indexeddb/IDBTransaction.h:
* inspector/InspectorIndexedDBAgent.cpp:
(WebCore):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117338 268f45cc-cd09-0410-ab3c-d52691b4dbfc