Remove GLContext::Destroy

ui/gl/gl_context_cgl.h

Index: ui/gl/gl_context_cgl.h
diff --git a/ui/gl/gl_context_cgl.h b/ui/gl/gl_context_cgl.h
index 88813b39cc197b298ec4a34889a5fb003067aa8b..2c019988a23ba04136c1c57bb9c93f2c67cea256 100644
--- a/ui/gl/gl_context_cgl.h
+++ b/ui/gl/gl_context_cgl.h
@@ -21,7 +21,6 @@ class GLContextCGL : public GLContextReal {
   // Implement GLContext.
   bool Initialize(GLSurface* compatible_surface,
                   GpuPreference gpu_preference) override;
-  void Destroy() override;
   bool MakeCurrent(GLSurface* surface) override;
   void ReleaseCurrent(GLSurface* surface) override;
   bool IsCurrent(GLSurface* surface) override;
@@ -35,6 +34,7 @@ class GLContextCGL : public GLContextReal {
   ~GLContextCGL() override;
 
  private:
+  void Destroy();
   GpuPreference GetGpuPreference();
 
   void* context_;