ui: Move gl/ directory out of gfx/, up to ui/.

ui/gl/gl_context_cgl.h

Index: ui/gl/gl_context_cgl.h
diff --git a/ui/gfx/gl/gl_context_cgl.h b/ui/gl/gl_context_cgl.h
similarity index 89%
rename from ui/gfx/gl/gl_context_cgl.h
rename to ui/gl/gl_context_cgl.h
index a33e2adb5eff591e682da773c988ca3b876e1fb6..0331568d971c8405eb80707b6d86ff969f2fa18e 100644
--- a/ui/gfx/gl/gl_context_cgl.h
+++ b/ui/gl/gl_context_cgl.h
@@ -2,7 +2,11 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/gfx/gl/gl_context.h"
+#ifndef UI_GL_GL_CONTEXT_CGL_H_
+#define UI_GL_GL_CONTEXT_CGL_H_
+#pragma once
+
+#include "ui/gl/gl_context.h"
 
 namespace gfx {
 
@@ -43,3 +47,5 @@ class GLContextCGL : public GLContext {
 };
 
 }  // namespace gfx
+
+#endif  // UI_GL_GL_CONTEXT_CGL_H_