clean up more dead code

src/utils/SkRunnable.h

Index: src/utils/SkRunnable.h
diff --git a/src/utils/SkRunnable.h b/src/utils/SkRunnable.h
deleted file mode 100644
index 7a93b60c898018f6bac149c402703b442c943509..0000000000000000000000000000000000000000
--- a/src/utils/SkRunnable.h
+++ /dev/null
@@ -1,16 +0,0 @@
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef SkRunnable_DEFINED
-#define SkRunnable_DEFINED
-
-struct SkRunnable {
-    virtual ~SkRunnable() {};
-    virtual void run() = 0;
-};
-
-#endif