some cleanup around GrGpu/GrDrawTarget copySurface

src/gpu/GrGpu.cpp

Index: src/gpu/GrGpu.cpp
diff --git a/src/gpu/GrGpu.cpp b/src/gpu/GrGpu.cpp
index 74e9419e7485e12fdd4f3104e6ba2c65ccf7789b..d97809f9520c671b9cfbc974858a78d938255a50 100644
--- a/src/gpu/GrGpu.cpp
+++ b/src/gpu/GrGpu.cpp
@@ -209,13 +209,6 @@ void GrGpu::resolveRenderTarget(GrRenderTarget* target) {
     this->onResolveRenderTarget(target);
 }
 
-void GrGpu::initCopySurfaceDstDesc(const GrSurface* src, GrSurfaceDesc* desc) {
-    // Make the dst of the copy be a render target because the default copySurface draws to the dst.
-    desc->fOrigin = kDefault_GrSurfaceOrigin;
-    desc->fFlags = kRenderTarget_GrSurfaceFlag | kNoStencil_GrSurfaceFlag;
-    desc->fConfig = src->config();
-}
-
 typedef GrTraceMarkerSet::Iter TMIter;
 void GrGpu::saveActiveTraceMarkers() {
     if (this->caps()->gpuTracingSupport()) {