Merge 22907 - A blind fix for Issue 18837 (and a build fix for VS2008)...

Merge 22907 - 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

TBR=hbono@chromium.org


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=23258

[Hironori Bono, 2009-08-13 01:04:29]

LGTM.
Thank you for merging this change.