Clean up unused SkPictureRecorder::optimizeFor()

include/core/SkPictureRecorder.h

Index: include/core/SkPictureRecorder.h
diff --git a/include/core/SkPictureRecorder.h b/include/core/SkPictureRecorder.h
index f20a06adf44fa41d3e166f3b7fc2ac3677675006..c824189300b1dea62a158c631ff95fe5b40a1ce5 100644
--- a/include/core/SkPictureRecorder.h
+++ b/include/core/SkPictureRecorder.h
@@ -112,9 +112,6 @@ public:
     SkPicture* SK_WARN_UNUSED_RESULT endRecording() { return this->endRecordingAsPicture(); }
 #endif
 
-    // Strawman API.
-    void optimizeFor(GrContext* ctx) { fGrContextToOptimizeFor = ctx; }
-
 private:
     void reset();
 
@@ -135,8 +132,6 @@ private:
     SkAutoTUnref<SkRecord>        fRecord;
     SkMiniRecorder                fMiniRecorder;
 
-    GrContext*                    fGrContextToOptimizeFor = nullptr;
-
     typedef SkNoncopyable INHERITED;
 };