Change SkDecodingImageGenerator API

src/lazy/SkDiscardablePixelRef.cpp

Index: src/lazy/SkDiscardablePixelRef.cpp
diff --git a/src/lazy/SkDiscardablePixelRef.cpp b/src/lazy/SkDiscardablePixelRef.cpp
index 160ca5b4fbacdaae84f040c5eae3084f10b36cd6..2886156102937faeb734f2891b74daaff47dba61 100644
--- a/src/lazy/SkDiscardablePixelRef.cpp
+++ b/src/lazy/SkDiscardablePixelRef.cpp
@@ -72,20 +72,19 @@ bool SkInstallDiscardablePixelRef(SkImageGenerator* generator,
                                   SkBitmap* dst,
                                   SkDiscardableMemory::Factory* factory) {
     SkImageInfo info;
-    SkASSERT(generator != NULL);
-    if ((NULL == generator)
-        || (!generator->getInfo(&info))
+    SkAutoTDelete<SkImageGenerator> autoGenerator(generator);
+    if ((NULL == autoGenerator.get())
+        || (!autoGenerator->getInfo(&info))
         || (!dst->setConfig(info, 0))) {
-        SkDELETE(generator);
         return false;
     }
     SkASSERT(dst->config() != SkBitmap::kNo_Config);
-    if (dst->empty()) { // Use a normal pixelref.
-        SkDELETE(generator);  // Do not need this anymore.
+    if (dst->empty()) {  // Use a normal pixelref.
         return dst->allocPixels(NULL, NULL);
     }
-    SkAutoTUnref<SkDiscardablePixelRef> ref(SkNEW_ARGS(SkDiscardablePixelRef,
-                               (info, generator, dst->rowBytes(), factory)));
+    SkAutoTUnref<SkDiscardablePixelRef> ref(
+        SkNEW_ARGS(SkDiscardablePixelRef,
+                   (info, autoGenerator.detach(), dst->rowBytes(), factory)));
     dst->setPixelRef(ref);
     return true;
 }