Switch to new lazy image readPixels behavior

Change-Id: I1b1d883dfae7611459547b308f0e42f291c36679
Reviewed-on: https://chromium-review.googlesource.com/c/1293790
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601910}

skia/config/SkUserConfig.h

@@ -158,8 +158,6 @@ SK_API void SkDebugf_FileLine(const char* file, int line, bool fatal,
 #define SK_SUPPORT_LEGACY_AAA_CHOICE
 #endif
 
-#define SK_USE_LEGACY_LAZY_IMAGE_DECODE
-
 ///////////////////////// Imported from BUILD.gn and skia_common.gypi
 
 /* In some places Skia can use static initializers for global initialization,