Remove use of varargs in SkImageFilter.  This is causing a crash in recent
builds of clang.  (It was also masking the fact that SkMergeImageFilter was
calling the wrong constructor!)

Review URL: https://codereview.appspot.com/6709066

git-svn-id: http://skia.googlecode.com/svn/trunk@6029 2bbb7eff-a529-9590-31e7-b0007b416f81
6 files changed