fix a bug in scrolling BitmapText gpu cached textblobs

src/gpu/GrTextBlobCache.cpp

Index: src/gpu/GrTextBlobCache.cpp
diff --git a/src/gpu/GrTextBlobCache.cpp b/src/gpu/GrTextBlobCache.cpp
index d2153bdc2c1db516a7365110251ca72efc4677e2..d66f432efbe28aa99c2b34a4def141af0d6a2d46 100644
--- a/src/gpu/GrTextBlobCache.cpp
+++ b/src/gpu/GrTextBlobCache.cpp
@@ -36,11 +36,6 @@ GrAtlasTextContext::BitmapTextBlob* GrTextBlobCache::createBlob(int glyphCount,
     }
     cacheBlob->fRunCount = runCount;
     cacheBlob->fPool = &fPool;
-
-#ifdef SK_DEBUG
-    cacheBlob->fTotalXError = 0;
-    cacheBlob->fTotalYError = 0;
-#endif
     return cacheBlob;
 }