Remove GetPlatformDefaultEGLNativeDisplay() function.

ui/gl/gl_surface_egl_android.cc

Index: ui/gl/gl_surface_egl_android.cc
diff --git a/ui/gl/gl_surface_egl_android.cc b/ui/gl/gl_surface_egl_android.cc
deleted file mode 100644
index 5cb8c13c519d25d6d3adf7c31da2c387f0eb575e..0000000000000000000000000000000000000000
--- a/ui/gl/gl_surface_egl_android.cc
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/gl/gl_surface_egl.h"
-
-#include "third_party/khronos/EGL/egl.h"
-
-namespace gl {
-
-EGLNativeDisplayType GetPlatformDefaultEGLNativeDisplay() {
-  return EGL_DEFAULT_DISPLAY;
-}
-
-}  // namespace gl