Refactor client visibility handling

gpu/command_buffer/client/gles2_implementation.cc

Index: gpu/command_buffer/client/gles2_implementation.cc
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index d660b99c445387ee40c3fd8a94fce65c7979bc8d..aa3b18d4e783c28b8bb69de4ca9198c64856346c 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -5861,20 +5861,6 @@ void GLES2Implementation::SetErrorMessageCallback(
   error_message_callback_ = callback;
 }
 
-void GLES2Implementation::SetClientVisible(int client_id, bool is_visible) {
-  if (is_visible) {
-    visible_clients_.insert(client_id);
-  } else {
-    auto found = visible_clients_.find(client_id);
-    if (found != visible_clients_.end())
-      visible_clients_.erase(found);
-  }
-}
-
-bool GLES2Implementation::AnyClientsVisible() const {
-  return !visible_clients_.empty();
-}
-
 void GLES2Implementation::SetLostContextCallback(
     const base::Closure& callback) {
   lost_context_callback_ = callback;