Revert of Add ThreadChecker for Ozone X11 GPU.

ui/ozone/platform/x11/x11_surface_factory.cc

Index: ui/ozone/platform/x11/x11_surface_factory.cc
diff --git a/ui/ozone/platform/x11/x11_surface_factory.cc b/ui/ozone/platform/x11/x11_surface_factory.cc
index 484dc650f7d9b18d71fecab9b3d6c7f9efb294e7..bb92d7eba3b4317b6aacffeb78eca828ec7a7843 100644
--- a/ui/ozone/platform/x11/x11_surface_factory.cc
+++ b/ui/ozone/platform/x11/x11_surface_factory.cc
@@ -158,7 +158,6 @@
 
 std::vector<gl::GLImplementation>
 X11SurfaceFactory::GetAllowedGLImplementations() {
-  DCHECK(thread_checker_.CalledOnValidThread());
   std::vector<gl::GLImplementation> impls;
   impls.push_back(gl::kGLImplementationEGLGLES2);
   // DesktopGL (GLX) should be the first option when crbug.com/646982 is fixed.
@@ -168,7 +167,6 @@
 }
 
 GLOzone* X11SurfaceFactory::GetGLOzone(gl::GLImplementation implementation) {
-  DCHECK(thread_checker_.CalledOnValidThread());
   switch (implementation) {
     case gl::kGLImplementationDesktopGL:
       return glx_implementation_.get();