Add a WebKit1 database provider

Add a WebKit1 database provider
https://bugs.webkit.org/show_bug.cgi?id=140126

Reviewed by Sam Weinig.

Source/WebCore:

Use a Ref instead of a RefPtr since the database provider can never be null now.

* Modules/indexeddb/DOMWindowIndexedDatabase.cpp:
(WebCore::DOMWindowIndexedDatabase::indexedDB):
* page/Page.cpp:
(WebCore::Page::Page):
* page/Page.h:
(WebCore::Page::databaseProvider):

Source/WebKit:

Add a stubbed out database provider.

* Storage/WebDatabaseProvider.cpp: Added.
(WebDatabaseProvider::shared):
(WebDatabaseProvider::WebDatabaseProvider):
(WebDatabaseProvider::~WebDatabaseProvider):
(WebDatabaseProvider::createIDBFactoryBackend):
* Storage/WebDatabaseProvider.h: Added.
* WebKit.vcxproj/WebKit/WebKit.vcxproj:
* WebKit.vcxproj/WebKit/WebKit.vcxproj.filters:
* WebKit.xcodeproj/project.pbxproj:

Source/WebKit/mac:

Set the database provider.

* WebView/WebView.mm:
(-[WebView _commonInitializationWithFrameName:groupName:]):

Source/WebKit/win:

Set the database provider.

* WebView.cpp:
(WebView::initWithFrame):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@177963 268f45cc-cd09-0410-ab3c-d52691b4dbfc