A blind fix for Issue 18837 (and a build fix for VS2008) To read this crash dump, this issue is caused by my mistake that this jumplist.cc calls "icon_urls_.front()" for an empty list. This change added some checks that verifies a std::list has one or more items. This change also fixes linker errors because of conflicted symbols: CLSID_DestinationList and CLSID_EnumerableObjectCollection, which is caused by my mistake that I forgot removing "EXTERN_C" keywords when I moved them into an anonymous namespace. This change removes the "EXTERN_C" keywords for VS2008.
A blind fix for Issue 18837 (and a build fix for VS2008)
To read this crash dump, this issue is caused by my mistake that this jumplist.cc calls "icon_urls_.front()" for an empty list.
This change added some checks that verifies a std::list has one or more items.
This change also fixes linker errors because of conflicted symbols: CLSID_DestinationList and CLSID_EnumerableObjectCollection, which is caused by my mistake that I forgot removing "EXTERN_C" keywords when I moved them into an anonymous namespace. This change removes the "EXTERN_C" keywords for VS2008.

BUG=18837 "Crash - JumpList::OnFavIconDataAvailable(int,bool,scoped_refptr<RefCountedVector<unsigned char> >,bool,GURL)"
TEST=Show JumpList on Windows 7.
TEST=Build Chromium with VS2008.
Review URL: http://codereview.chromium.org/159853

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@22907 0039d316-1c4b-4281-b951-d872f2087c98

ropik/chromium,ropik/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,adobe/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,adobe/chromium,yitian134/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,adobe/chromium,yitian134/chromium,adobe/chromium