Revert "Turn NVPR on by default (but off in tools)."

include/gpu/gl/GrGLConfig.h

Index: include/gpu/gl/GrGLConfig.h
diff --git a/include/gpu/gl/GrGLConfig.h b/include/gpu/gl/GrGLConfig.h
index 444be00f158d26a912f0ae4b256e7a40a07d6b4e..842c303f3834a0b5d5a0326c9a43dc75ff3c963a 100644
--- a/include/gpu/gl/GrGLConfig.h
+++ b/include/gpu/gl/GrGLConfig.h
@@ -93,6 +93,10 @@
  * stencil formats as attachments. If the FBO is complete we will assume
  * subsequent attachments with the same formats are complete as well.
  *
+ * GR_GL_USE_NV_PATH_RENDERING: Enable experimental support for
+ * GL_NV_path_rendering. There are known issues with clipping, non-AA paths, and
+ * perspective.
+ *
  * GR_GL_MUST_USE_VBO: Indicates that all vertices and indices must be rendered
  * from VBOs. Chromium's command buffer doesn't allow glVertexAttribArray with
  * ARARY_BUFFER 0 bound or glDrawElements with ELEMENT_ARRAY_BUFFER 0 bound.
@@ -154,6 +158,10 @@
     #define GR_GL_CHECK_FBO_STATUS_ONCE_PER_FORMAT      0
 #endif
 
+#if !defined(GR_GL_USE_NV_PATH_RENDERING)
+    #define GR_GL_USE_NV_PATH_RENDERING                 0
+#endif
+
 #if !defined(GR_GL_MUST_USE_VBO)
     #define GR_GL_MUST_USE_VBO                          0
 #endif