Rework disabled IconDatabase builds while allowing for a pluggable icon database implementation.

../WebCore: 

Reviewed by Sam Weinig.

Project file stuff:
* Android.mk:
* CMakeLists.txt:
* GNUmakefile.am:
* WebCore.gyp/WebCore.gyp:
* WebCore.gypi:
* WebCore.pro:
* WebCore.xcodeproj/project.pbxproj:
* WebCore.vcproj/WebCore.vcproj:

* loader/icon/IconDatabase.cpp:
* loader/icon/IconDatabase.h: Inherit from IconDatabaseBase.

* loader/icon/IconDatabaseBase.cpp: Added.
(WebCore::IconDatabaseBase::iconURLForPageURL):
(WebCore::iconDatabase):
(WebCore::setGlobalIconDatabase):
* loader/icon/IconDatabaseBase.h: Added.
(WebCore::IconDatabaseBase::IconDatabaseBase):
(WebCore::IconDatabaseBase::~IconDatabaseBase):
(WebCore::IconDatabaseBase::setEnabled):
(WebCore::IconDatabaseBase::isEnabled):
(WebCore::IconDatabaseBase::defaultIcon):
(WebCore::IconDatabaseBase::retainIconForPageURL):
(WebCore::IconDatabaseBase::releaseIconForPageURL):
(WebCore::IconDatabaseBase::iconForPageURL):
(WebCore::IconDatabaseBase::setIconURLForPageURL):
(WebCore::IconDatabaseBase::setIconDataForIconURL):
(WebCore::IconDatabaseBase::iconDataKnownForIconURL):
(WebCore::IconDatabaseBase::loadDecisionForIconURL):
(WebCore::IconDatabaseBase::pageURLMappingCount):
(WebCore::IconDatabaseBase::retainedPageURLCount):
(WebCore::IconDatabaseBase::iconRecordCount):
(WebCore::IconDatabaseBase::iconRecordCountWithData):
(WebCore::IconDatabaseBase::importIconURLForPageURL):
(WebCore::IconDatabaseBase::importIconDataForIconURL):
(WebCore::IconDatabaseBase::shouldStopThreadActivity):
(WebCore::IconDatabaseBase::open):
(WebCore::IconDatabaseBase::close):
(WebCore::IconDatabaseBase::removeAllIcons):
(WebCore::IconDatabaseBase::setPrivateBrowsingEnabled):
(WebCore::IconDatabaseBase::setClient):

* loader/icon/IconDatabaseNone.cpp: Removed.

../WebKit/mac: 

Reviewed by Anders Carlsson

* Misc/WebIconDatabase.mm:
(+[WebIconDatabase _checkIntegrityBeforeOpening]): Call these static methods on IconDatabase::, not iconDatabase().
(-[WebIconDatabase _startUpIconDatabase]): Ditto.
(importToWebCoreFormat):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@80900 268f45cc-cd09-0410-ab3c-d52691b4dbfc