Convert GrClip to an abstract base class

tests/TessellatingPathRendererTests.cpp

Index: tests/TessellatingPathRendererTests.cpp
diff --git a/tests/TessellatingPathRendererTests.cpp b/tests/TessellatingPathRendererTests.cpp
index 62ad6e2c645f400504eb3faeeffed44471048e73..a3eb4893d39e9fcb09d66f80acb154977a4a3902 100644
--- a/tests/TessellatingPathRendererTests.cpp
+++ b/tests/TessellatingPathRendererTests.cpp
@@ -239,11 +239,12 @@ static void test_path(GrDrawTarget* dt, GrRenderTarget* rt, GrResourceProvider*
     pipelineBuilder.setXPFactory(
         GrPorterDuffXPFactory::Create(SkXfermode::kSrc_Mode))->unref();
     pipelineBuilder.setRenderTarget(rt);
+    GrNoClip noClip;
     GrStyle style(SkStrokeRec::kFill_InitStyle);
     GrPathRenderer::DrawPathArgs args;
     args.fTarget = dt;
     args.fPipelineBuilder = &pipelineBuilder;
-    args.fClip = &GrClip::WideOpen();
+    args.fClip = &noClip;
     args.fResourceProvider = rp;
     args.fColor = GrColor_WHITE;
     args.fViewMatrix = &SkMatrix::I();