Remove unused refSkPixelRef

Test: Build

Change-Id: Iac21b08217113787765b5be611f7e1e66b317904
diff --git a/core/jni/android/graphics/Graphics.cpp b/core/jni/android/graphics/Graphics.cpp
index 0933e98..5d65aee 100644
--- a/core/jni/android/graphics/Graphics.cpp
+++ b/core/jni/android/graphics/Graphics.cpp
@@ -355,11 +355,6 @@
     bitmap::toBitmap(env, bitmap).getSkBitmap(outBitmap);
 }
 
-SkPixelRef* GraphicsJNI::refSkPixelRef(JNIEnv* env, jobject jbitmap) {
-    android::Bitmap& bitmap = android::bitmap::toBitmap(env, jbitmap);
-    bitmap.ref();
-    return &bitmap;
-}
 SkColorType GraphicsJNI::getNativeBitmapColorType(JNIEnv* env, jobject jconfig) {
     ALOG_ASSERT(env);
     if (NULL == jconfig) {
diff --git a/core/jni/android/graphics/GraphicsJNI.h b/core/jni/android/graphics/GraphicsJNI.h
index dcb81fa..7825f1d 100644
--- a/core/jni/android/graphics/GraphicsJNI.h
+++ b/core/jni/android/graphics/GraphicsJNI.h
@@ -63,7 +63,6 @@
 
     static android::Canvas* getNativeCanvas(JNIEnv*, jobject canvas);
     static void getSkBitmap(JNIEnv*, jobject bitmap, SkBitmap* outBitmap);
-    static SkPixelRef* refSkPixelRef(JNIEnv*, jobject bitmap);
     static SkRegion* getNativeRegion(JNIEnv*, jobject region);
 
     /*