Remove callbacks for SurfaceFactoryOzone::LoadEGLGLES2Bindings().

ui/ozone/platform/headless/headless_surface_factory.cc

Index: ui/ozone/platform/headless/headless_surface_factory.cc
diff --git a/ui/ozone/platform/headless/headless_surface_factory.cc b/ui/ozone/platform/headless/headless_surface_factory.cc
index e5538fdb09af6df0cba02c4e1f08ae3a5b471ac6..95267eb82cf32cb829fd6e9faa0c2c634c965095 100644
--- a/ui/ozone/platform/headless/headless_surface_factory.cc
+++ b/ui/ozone/platform/headless/headless_surface_factory.cc
@@ -35,7 +35,7 @@ void WriteDataToFile(const base::FilePath& location, const SkBitmap& bitmap) {
 // TODO(altimin): Find a proper way to capture rendering output.
 class FileSurface : public SurfaceOzoneCanvas {
  public:
-  FileSurface(const base::FilePath& location) : location_(location) {}
+  explicit FileSurface(const base::FilePath& location) : location_(location) {}
   ~FileSurface() override {}
 
   // SurfaceOzoneCanvas overrides:
@@ -68,7 +68,7 @@ class FileSurface : public SurfaceOzoneCanvas {
 
 class TestPixmap : public ui::NativePixmap {
  public:
-  TestPixmap(gfx::BufferFormat format) : format_(format) {}
+  explicit TestPixmap(gfx::BufferFormat format) : format_(format) {}
 
   void* GetEGLClientBuffer() const override { return nullptr; }
   bool AreDmaBufFdsValid() const override { return false; }
@@ -117,12 +117,6 @@ HeadlessSurfaceFactory::CreateCanvasForWidget(gfx::AcceleratedWidget widget) {
   return base::WrapUnique<SurfaceOzoneCanvas>(new FileSurface(window->path()));
 }
 
-bool HeadlessSurfaceFactory::LoadEGLGLES2Bindings(
-    AddGLLibraryCallback add_gl_library,
-    SetGLGetProcAddressProcCallback set_gl_get_proc_address) {
-  return false;
-}
-
 scoped_refptr<NativePixmap> HeadlessSurfaceFactory::CreateNativePixmap(
     gfx::AcceleratedWidget widget,
     gfx::Size size,