Update all callsites to use info for pixelrefs

src/lazy/SkDiscardablePixelRef.h

Index: src/lazy/SkDiscardablePixelRef.h
diff --git a/src/lazy/SkDiscardablePixelRef.h b/src/lazy/SkDiscardablePixelRef.h
index 44c6df9637ab2db5dc503d9e872095c29a09ad02..4b6693837d5ade9f8a91c5dfae304b94b774f7d6 100644
--- a/src/lazy/SkDiscardablePixelRef.h
+++ b/src/lazy/SkDiscardablePixelRef.h
@@ -30,8 +30,6 @@ protected:
 private:
     SkImageGenerator* const fGenerator;
     SkDiscardableMemory::Factory* const fDMFactory;
-    const SkImageInfo fInfo;
-    const size_t fSize;  // size of memory to be allocated
     const size_t fRowBytes;
     // These const members should not change over the life of the
     // PixelRef, since the SkBitmap doesn't expect them to change.
@@ -39,9 +37,7 @@ private:
     SkDiscardableMemory* fDiscardableMemory;
 
     /* Takes ownership of SkImageGenerator. */
-    SkDiscardablePixelRef(SkImageGenerator* generator,
-                          const SkImageInfo& info,
-                          size_t size,
+    SkDiscardablePixelRef(const SkImageInfo&, SkImageGenerator*,
                           size_t rowBytes,
                           SkDiscardableMemory::Factory* factory);
     friend bool SkInstallDiscardablePixelRef(SkImageGenerator*,