Revert of cc: Move worker context BindToCurrentThread/SetupLock calls out of cc::OutputSurface.

content/browser/compositor/gpu_process_transport_factory.cc

Index: content/browser/compositor/gpu_process_transport_factory.cc
diff --git a/content/browser/compositor/gpu_process_transport_factory.cc b/content/browser/compositor/gpu_process_transport_factory.cc
index bf1af95fb043f29ae89322d9949d107b9c74f470..4c0b3630df7eaa3c2565da02b28c9161b2467e5a 100644
--- a/content/browser/compositor/gpu_process_transport_factory.cc
+++ b/content/browser/compositor/gpu_process_transport_factory.cc
@@ -265,13 +265,6 @@
         if (shared_worker_context_provider_ &&
             !shared_worker_context_provider_->BindToCurrentThread())
           shared_worker_context_provider_ = nullptr;
-
-        if (shared_worker_context_provider_) {
-          shared_worker_context_provider_->SetupLock();
-          // Detach from thread to allow context to be destroyed on a
-          // different thread without being used.
-          shared_worker_context_provider_->DetachFromThread();
-        }
       }
     }