win: Ref-counted classes should have non-public destructors.

ui/gl/gl_context_wgl.h

Index: ui/gl/gl_context_wgl.h
diff --git a/ui/gl/gl_context_wgl.h b/ui/gl/gl_context_wgl.h
index 7a0a4370b800a685ed3ef7a90491e8d4f5f39a5c..ff0aae0d96f98583d0e14b48d4e3d3ae04fccf44 100644
--- a/ui/gl/gl_context_wgl.h
+++ b/ui/gl/gl_context_wgl.h
@@ -18,7 +18,6 @@ class GLSurface;
 class GLContextWGL : public GLContextReal {
  public:
   explicit GLContextWGL(GLShareGroup* share_group);
-  ~GLContextWGL() override;
 
   // Implement GLContext.
   bool Initialize(GLSurface* compatible_surface,
@@ -32,6 +31,8 @@ class GLContextWGL : public GLContextReal {
   std::string GetExtensions() override;
 
  private:
+  ~GLContextWGL() override;
+
   HGLRC context_;
 
   DISALLOW_COPY_AND_ASSIGN(GLContextWGL);