Clean up unused SkPictureRecorder::optimizeFor()

include/core/SkPictureRecorder.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPictureRecorder_DEFINED
 #define SkPictureRecorder_DEFINED
 
@@ skipping 94 matching lines @@
     }
     SkPicture* SK_WARN_UNUSED_RESULT endRecordingAsPicture(const SkRect& cullRect) {
         return this->finishRecordingAsPictureWithCull(cullRect).release();
     }
     SkDrawable* SK_WARN_UNUSED_RESULT endRecordingAsDrawable() {
         return this->finishRecordingAsDrawable().release();
     }
     SkPicture* SK_WARN_UNUSED_RESULT endRecording() { return this->endRecordingAsPicture(); }
 #endif
 
-    // Strawman API.
-    void optimizeFor(GrContext* ctx) { fGrContextToOptimizeFor = ctx; }
-
 private:
     void reset();
 
     /** Replay the current (partially recorded) operation stream into
         canvas. This call doesn't close the current recording.
     */
 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
     friend class android::Picture;
 #endif
     friend class SkPictureRecorderReplayTester; // for unit testing
     void partialReplay(SkCanvas* canvas) const;
 
     bool                          fActivelyRecording;
     uint32_t                      fFlags;
     SkRect                        fCullRect;
     SkAutoTUnref<SkBBoxHierarchy> fBBH;
     SkAutoTUnref<SkRecorder>      fRecorder;
     SkAutoTUnref<SkRecord>        fRecord;
     SkMiniRecorder                fMiniRecorder;
 
-    GrContext*                    fGrContextToOptimizeFor = nullptr;
-
     typedef SkNoncopyable INHERITED;
 };
 
 #endif