Remove unused field fBitmapBytes

Bug: skia:
Change-Id: I3544b8ed8a02447e765a5389a4c0ea9ca2f09944
Reviewed-on: https://skia-review.googlesource.com/120240
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Yuqian Li <liyuqian@google.com>
diff --git a/src/shaders/SkPictureShader.cpp b/src/shaders/SkPictureShader.cpp
index 84a8d08..1d19b04 100644
--- a/src/shaders/SkPictureShader.cpp
+++ b/src/shaders/SkPictureShader.cpp
@@ -85,7 +85,6 @@
 
     BitmapShaderKey fKey;
     sk_sp<SkShader> fShader;
-    size_t          fBitmapBytes;
 
     const Key& getKey() const override { return fKey; }
     size_t bytesUsed() const override {