| Index: ui/gl/gl_surface_glx.cc | 
| diff --git a/ui/gl/gl_surface_glx.cc b/ui/gl/gl_surface_glx.cc | 
| index b08a5d055632e3ca708baef7458cd1a6ea04eec0..17a481a4de3809988ce9025e80631242e7395fd4 100644 | 
| --- a/ui/gl/gl_surface_glx.cc | 
| +++ b/ui/gl/gl_surface_glx.cc | 
| @@ -615,13 +615,8 @@ void* NativeViewGLSurfaceGLX::GetHandle() { | 
| return reinterpret_cast<void*>(GetDrawableHandle()); | 
| } | 
|  | 
| -std::string NativeViewGLSurfaceGLX::GetExtensions() { | 
| -  std::string extensions = GLSurface::GetExtensions(); | 
| -  if (gfx::g_driver_glx.ext.b_GLX_MESA_copy_sub_buffer) { | 
| -    extensions += extensions.empty() ? "" : " "; | 
| -    extensions += "GL_CHROMIUM_post_sub_buffer"; | 
| -  } | 
| -  return extensions; | 
| +bool NativeViewGLSurfaceGLX::SupportsPostSubBuffer() { | 
| +  return gfx::g_driver_glx.ext.b_GLX_MESA_copy_sub_buffer; | 
| } | 
|  | 
| void* NativeViewGLSurfaceGLX::GetConfig() { | 
|  |