Make NativePixmap unittests use TEXTURE_EXTERNAL_OES.

ui/gl/gl_image_ozone_native_pixmap_unittest.cc

Index: ui/gl/gl_image_ozone_native_pixmap_unittest.cc
diff --git a/ui/gl/gl_image_ozone_native_pixmap_unittest.cc b/ui/gl/gl_image_ozone_native_pixmap_unittest.cc
index d0877ae799f446db206601810e2a711c10deb866..badc459fc38275259485162cd14e381a97e0bf57 100644
--- a/ui/gl/gl_image_ozone_native_pixmap_unittest.cc
+++ b/ui/gl/gl_image_ozone_native_pixmap_unittest.cc
@@ -50,7 +50,7 @@ class GLImageOzoneNativePixmapTestDelegate {
     return image;
   }
 
-  unsigned GetTextureTarget() const { return GL_TEXTURE_2D; }
+  unsigned GetTextureTarget() const { return GL_TEXTURE_EXTERNAL_OES; }
 
   const uint8_t* GetImageColor() {
     return format == gfx::BufferFormat::R_8 ? kRed : kGreen;