Revert of Return GrGLContext from GrTestTarget

src/gpu/gl/GrGLContext.h

Index: src/gpu/gl/GrGLContext.h
diff --git a/src/gpu/gl/GrGLContext.h b/src/gpu/gl/GrGLContext.h
index 6016f6859a35e5cbfd9213dd043d6b85813e7f2d..f86007a217f13a880ddeb7c415d70b68be810979 100644
--- a/src/gpu/gl/GrGLContext.h
+++ b/src/gpu/gl/GrGLContext.h
@@ -20,7 +20,7 @@
  * Encapsulates information about an OpenGL context including the OpenGL
  * version, the GrGLStandard type of the context, and GLSL version.
  */
-class GrGLContextInfo : public SkRefCnt {
+class GrGLContextInfo : public SkNoncopyable {
 public:
     GrGLStandard standard() const { return fInterface->fStandard; }
     GrGLVersion version() const { return fGLVersion; }