Remove -webkit-svg-shadow

This patch removes the non-standard -webkit-svg-shadow property per the intent to deprecate thread on blink-dev: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/Rsq5BecyyNU

BUG=262857

Review URL: https://chromiumcodereview.appspot.com/20237002

git-svn-id: svn://svn.chromium.org/blink/trunk@154982 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Rename CachedResource to Resouce, and related classes respectively.

This change contains following renames:
- CachedResoue -> Resource
- CachedResourceHandle -> ResourcePtr
  (dropped "Handle" to avoid confusion with other handle classes)
- CachedResourceInitiatorInfo -> FetchInitiatorInfo
- CachedResourceClient -> ResourceClient
- CachedResourceClient -> ResourceClientWalker

TEST=none
BUG=none
TBR=abarth, japhet@chromium.org

Review URL: https://chromiumcodereview.appspot.com/20215004

git-svn-id: svn://svn.chromium.org/blink/trunk@154984 bbb929c8-8fbe-4397-9dbb-9b2b20218538