Deprecate SkPicture::clone().

src/utils/SkCountdown.cpp

Index: src/utils/SkCountdown.cpp
diff --git a/src/utils/SkCountdown.cpp b/src/utils/SkCountdown.cpp
deleted file mode 100644
index 98b35450717721d3baefe661defd004d82bcb042..0000000000000000000000000000000000000000
--- a/src/utils/SkCountdown.cpp
+++ /dev/null
@@ -1,32 +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.
- */
-
-#include "SkCountdown.h"
-#include "SkThread.h"
-
-SkCountdown::SkCountdown(int32_t count)
-: fCount(count) {}
-
-void SkCountdown::reset(int32_t count) {
-    fCount = count;
-}
-
-void SkCountdown::run() {
-    if (sk_atomic_dec(&fCount) == 1) {
-        fReady.lock();
-        fReady.signal();
-        fReady.unlock();
-    }
-}
-
-void SkCountdown::wait() {
-    fReady.lock();
-    while (fCount > 0) {
-        fReady.wait();
-    }
-    fReady.unlock();
-}