Replacing local filter with skia filters

Replaced SkImageFilter derived classes defined in blink by the equivalent classes previously copied to skia and removed all blink side SkImageFilter derived classes.

R=senorblanco

BUG=

Review URL: https://codereview.chromium.org/25087003

git-svn-id: svn://svn.chromium.org/blink/trunk@161454 bbb929c8-8fbe-4397-9dbb-9b2b20218538