Nobody is using the CollectionCache copy constructor or associated methods swap() and copyCacheMap(). Let's remove them and make the class noncopyable.
Created attachment 118934 [details]
Attachment 118934 [details] did not pass style-queue:
Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1
Source/WebCore/html/CollectionCache.h:33: More than one command on the same line [whitespace/newline] 
Total errors found: 1 in 2 files
If any of these errors are false positives, please file a bug against check-webkit-style.
Comment on attachment 118934 [details]
Yay for removal of dead code :)
Committed r102669: <http://trac.webkit.org/changeset/102669>