Global IconDatabase should be returned by reference, not as a pointer

Reviewed by Darin Adler.

../WebCore: 

* history/HistoryItem.cpp:
(WebCore::HistoryItem::HistoryItem):
(WebCore::HistoryItem::~HistoryItem):
(WebCore::HistoryItem::reset):
(WebCore::HistoryItem::icon):
(WebCore::HistoryItem::setURLString):

* loader/FrameLoader.cpp:
(WebCore::FrameLoader::startIconLoader):
(WebCore::FrameLoader::commitIconURLToIconDatabase):

* loader/archive/cf/LegacyWebArchive.cpp:
(WebCore::LegacyWebArchive::create):

* loader/icon/IconDatabase.cpp:
(WebCore::iconDatabase):
* loader/icon/IconDatabase.h:
* loader/icon/IconDatabaseNone.cpp:
(WebCore::iconDatabase):
* loader/icon/wince/IconDatabaseWinCE.cpp:
(WebCore::iconDatabase):

* loader/icon/IconLoader.cpp:
(WebCore::IconLoader::finishLoading):

../WebKit/efl: 

* ewk/ewk_settings.cpp:
(ewk_settings_icon_database_path_set):
(ewk_settings_icon_database_path_get):
(ewk_settings_icon_database_clear):
(ewk_settings_icon_database_icon_surface_get):
(ewk_settings_icon_database_icon_object_add):

../WebKit/gtk: 

* webkit/webkitglobals.cpp:
(closeIconDatabaseOnExit):
(WebKit::setIconDatabaseEnabled):
* webkit/webkitwebview.cpp:
(webkit_web_view_get_icon_uri):

../WebKit/mac: 

* Misc/WebCoreStatistics.mm:
(+[WebCoreStatistics iconPageURLMappingCount]):
(+[WebCoreStatistics iconRetainedPageURLCount]):
(+[WebCoreStatistics iconRecordCount]):
(+[WebCoreStatistics iconsWithDataCount]):
* Misc/WebIconDatabase.mm:
(-[WebIconDatabase init]):
(-[WebIconDatabase iconForURL:withSize:cache:]):
(-[WebIconDatabase iconURLForURL:]):
(-[WebIconDatabase defaultIconWithSize:]):
(-[WebIconDatabase retainIconForURL:]):
(-[WebIconDatabase releaseIconForURL:]):
(-[WebIconDatabase isEnabled]):
(-[WebIconDatabase setEnabled:]):
(-[WebIconDatabase removeAllIcons]):
(+[WebIconDatabase _checkIntegrityBeforeOpening]):
(-[WebIconDatabase _startUpIconDatabase]):
(-[WebIconDatabase _applicationWillTerminate:]):
(-[WebIconDatabase _resetCachedWebPreferences:]):
(importToWebCoreFormat):
* WebView/WebView.mm:
(-[WebView _dispatchDidReceiveIconFromWebFrame:]):

../WebKit/qt: 

* Api/qwebsettings.cpp:
(QWebSettings::setIconDatabasePath):
(QWebSettings::iconDatabasePath):
(QWebSettings::clearIconDatabase):
(QWebSettings::iconForUrl):

../WebKit/win: 

* WebCoreStatistics.cpp:
(WebCoreStatistics::iconPageURLMappingCount):
(WebCoreStatistics::iconRetainedPageURLCount):
(WebCoreStatistics::iconRecordCount):
(WebCoreStatistics::iconsWithDataCount):
* WebIconDatabase.cpp:
(WebIconDatabase::init):
(WebIconDatabase::startUpIconDatabase):
(WebIconDatabase::iconForURL):
(WebIconDatabase::retainIconForURL):
(WebIconDatabase::releaseIconForURL):
(WebIconDatabase::removeAllIcons):
(WebIconDatabase::iconURLForURL):
(WebIconDatabase::isEnabled):
(WebIconDatabase::setEnabled):
(WebIconDatabase::hasIconForURL):
(WebIconDatabase::getOrCreateDefaultIconBitmap):
* WebKitDLL.cpp:
(shutDownWebKit):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@80299 268f45cc-cd09-0410-ab3c-d52691b4dbfc