Remove override on thread IO restrictions.

ui/gfx/compositor/compositor_gl.cc

Index: ui/gfx/compositor/compositor_gl.cc
diff --git a/ui/gfx/compositor/compositor_gl.cc b/ui/gfx/compositor/compositor_gl.cc
index d952f9bcfd992ec4a9c4e1127fddc510d6225e4d..f8fc13904dddb7412873ed1bdad7b683f7f1fd4e 100644
--- a/ui/gfx/compositor/compositor_gl.cc
+++ b/ui/gfx/compositor/compositor_gl.cc
@@ -10,7 +10,6 @@
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/threading/thread_restrictions.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkMatrix.h"
 #include "third_party/skia/include/core/SkScalar.h"
@@ -243,10 +242,6 @@ void CompositorGL::NotifyEnd() {
 
 // static
 Compositor* Compositor::Create(gfx::AcceleratedWidget widget) {
-  // The following line of code exists soley to disable IO restrictions
-  // on this thread long enough to perform the GL bindings.
-  // TODO(backer) Remove this when GL initialisation cleaned up.
-  base::ThreadRestrictions::ScopedAllowIO allow_io;
   // TODO(backer) Remove this when GL thread patch lands. Should be init'd
   // by the new GPU thread.
   // http://codereview.chromium.org/6677055/