SkOnce: let f be any functor, update comments

src/core/SkScaledImageCache.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkScaledImageCache.h"
 #include "SkMipMap.h"
 #include "SkOnce.h"
@@ skipping 501 matching lines @@
 
 SK_DECLARE_STATIC_MUTEX(gMutex);
 
 static void create_cache(SkScaledImageCache** cache) {
     *cache = SkNEW_ARGS(SkScaledImageCache, (SK_DEFAULT_IMAGE_CACHE_LIMIT));
 }
 
 static SkScaledImageCache* get_cache() {
     static SkScaledImageCache* gCache(NULL);
     SK_DECLARE_STATIC_ONCE(create_cache_once);
-    SkOnce<SkScaledImageCache**>(&create_cache_once, create_cache, &gCache);
+    SkOnce(&create_cache_once, create_cache, &gCache);
     SkASSERT(NULL != gCache);
     return gCache;
 }
 
 
 SkScaledImageCache::ID* SkScaledImageCache::FindAndLock(
                                 uint32_t pixelGenerationID,
                                 int32_t width,
                                 int32_t height,
                                 SkBitmap* scaled) {
@@ skipping 67 matching lines @@
     return SkScaledImageCache::GetBytesUsed();
 }
 
 size_t SkGraphics::GetImageCacheByteLimit() {
     return SkScaledImageCache::GetByteLimit();
 }
 
 size_t SkGraphics::SetImageCacheByteLimit(size_t newLimit) {
     return SkScaledImageCache::SetByteLimit(newLimit);
 }