Cleanup legacy NVPR-related definitions

src/gpu/GrContextFactory.cpp

Index: src/gpu/GrContextFactory.cpp
diff --git a/src/gpu/GrContextFactory.cpp b/src/gpu/GrContextFactory.cpp
index edef2f7db1cdc4802b96b25bb22cfd7bde94a582..f56e535b0e5587a891d04992bb69fb7e9976c301 100755
--- a/src/gpu/GrContextFactory.cpp
+++ b/src/gpu/GrContextFactory.cpp
@@ -68,6 +68,10 @@ GrContext* GrContextFactory::get(GLContextType type, GrGLStandard forcedGpuAPI)
         if (!glInterface) {
             return NULL;
         }
+    } else {
+        if (!glInterface->hasExtension("GL_NV_path_rendering")) {
+            return NULL;
+        }
     }
 
     glCtx->makeCurrent();