Cleanup some legacy instantiate calls

Since explicit resource allocation has stuck these instantiate calls are no longer required.

Change-Id: I5a8a7fa714eb1e9550f4f645ce8fced2d5f7aa4e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/222457
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/ops/GrAtlasTextOp.cpp b/src/gpu/ops/GrAtlasTextOp.cpp
index 646c9ea..998847d 100644
--- a/src/gpu/ops/GrAtlasTextOp.cpp
+++ b/src/gpu/ops/GrAtlasTextOp.cpp
@@ -328,7 +328,7 @@
 
     void* vertices = target->makeVertexSpace(vertexStride, glyphCount * kVerticesPerGlyph,
                                              &flushInfo.fVertexBuffer, &flushInfo.fVertexOffset);
-    flushInfo.fIndexBuffer = target->resourceProvider()->refQuadIndexBuffer();
+    flushInfo.fIndexBuffer = resourceProvider->refQuadIndexBuffer();
     if (!vertices || !flushInfo.fVertexBuffer) {
         SkDebugf("Could not allocate vertices\n");
         return;