Refactor GL bindings so there is no global GLApi or DriverGL.

ui/gl/gl_image_io_surface.mm

Index: ui/gl/gl_image_io_surface.mm
diff --git a/ui/gl/gl_image_io_surface.mm b/ui/gl/gl_image_io_surface.mm
index e56e4f21d779067f0eff424528d9ab42e765e25b..7b24aeaa67e119af7636709e6fc5ac92b09708fb 100644
--- a/ui/gl/gl_image_io_surface.mm
+++ b/ui/gl/gl_image_io_surface.mm
@@ -16,7 +16,6 @@
 #include "base/trace_event/trace_event.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
-#include "ui/gl/scoped_api.h"
 #include "ui/gl/scoped_binders.h"
 #include "ui/gl/yuv_to_rgb_converter.h"
 
@@ -280,8 +279,6 @@ bool GLImageIOSurface::CopyTexImage(unsigned target) {
   YUVToRGBConverter* yuv_to_rgb_converter = gl_context->GetYUVToRGBConverter();
   DCHECK(yuv_to_rgb_converter);
 
-  ScopedSetGLToRealGLApi scoped_set_gl_api;
-
   // Note that state restoration is done explicitly instead of scoped binders to
   // avoid https://crbug.com/601729.
   GLint rgb_texture = 0;