Remove dead flag from SkPictureRecorder

With the Chrome CL (https://codereview.chromium.org/2149533003/ (Remove use of unsupported Skia flag)) landed, this should be good to go.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2152943002

Review-Url: https://codereview.chromium.org/2152943002

include/core/SkPictureRecorder.h

@@ -31,13 +31,9 @@ public:
     ~SkPictureRecorder();
 
     enum RecordFlags {
-#ifdef SK_SUPPORT_LEGACY_COMPUTESAVELAYER_FLAG
-        kComputeSaveLayerInfo_RecordFlag    = 1 << 0,
-#endif
-
         // If you call drawPicture() or drawDrawable() on the recording canvas, this flag forces
         // that object to playback its contents immediately rather than reffing the object.
-        kPlaybackDrawPicture_RecordFlag     = 1 << 1,
+        kPlaybackDrawPicture_RecordFlag     = 1 << 0,
     };
 
     enum FinishFlags {