Reviewed by Darin Fisher.

        https://bugs.webkit.org/show_bug.cgi?id=26732

        For the final step of https://bugs.webkit.org/show_bug.cgi?id=25376,
        combine LocalStorage and SessionStorage into StorageNamespace. The
        synching code (for LocalStorage) has already been removed, so these
        classes are now very similar.  All they do is essentially contain a
        logical grouping of origins that are attached to specific contexts
        (be it PageGroups for LocalStorage and Page for SessionStorage).

        * GNUmakefile.am:
        * WebCore.vcproj/WebCore.vcproj:
        * WebCore.xcodeproj/project.pbxproj:
        * WebCoreSources.bkl:
        * page/Chrome.cpp:
        (WebCore::Chrome::createWindow):
        * page/DOMWindow.cpp:
        (WebCore::DOMWindow::localStorage):
        * page/DOMWindow.h:
        * page/Page.cpp:
        (WebCore::Page::sessionStorage):
        (WebCore::Page::setSessionStorage):
        * page/Page.h:
        * page/PageGroup.cpp:
        (WebCore::PageGroup::localStorage):
        * page/PageGroup.h:
        * storage/LocalStorage.cpp: Removed.
        * storage/LocalStorage.h: Removed.
        * storage/LocalStorageTask.cpp:
        * storage/LocalStorageThread.cpp:
        * storage/SessionStorage.cpp: Removed.
        * storage/SessionStorage.h: Removed.
        * storage/StorageArea.cpp:
        (WebCore::StorageArea::create):
        (WebCore::StorageArea::StorageArea):
        (WebCore::StorageArea::copy):
        (WebCore::StorageArea::length):
        (WebCore::StorageArea::key):
        (WebCore::StorageArea::getItem):
        (WebCore::StorageArea::setItem):
        (WebCore::StorageArea::removeItem):
        (WebCore::StorageArea::clear):
        (WebCore::StorageArea::contains):
        (WebCore::StorageArea::importItem):
        (WebCore::StorageArea::close):
        (WebCore::StorageArea::dispatchStorageEvent):
        * storage/StorageArea.h:
        (WebCore::):
        * storage/StorageAreaSync.cpp:
        (WebCore::StorageAreaSync::scheduleFinalSync):
        * storage/StorageNamespace.cpp: Copied from WebCore/storage/LocalStorage.cpp.
        (WebCore::localStorageNamespaceMap):
        (WebCore::StorageNamespace::localStorageNamespace):
        (WebCore::StorageNamespace::sessionStorageNamespace):
        (WebCore::StorageNamespace::StorageNamespace):
        (WebCore::StorageNamespace::~StorageNamespace):
        (WebCore::StorageNamespace::copy):
        (WebCore::StorageNamespace::storageArea):
        (WebCore::StorageNamespace::close):
        * storage/StorageNamespace.h: Copied from WebCore/storage/LocalStorage.h.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@45290 268f45cc-cd09-0410-ab3c-d52691b4dbfc