Refactor client visibility handling

cc/test/test_context_support.cc

Index: cc/test/test_context_support.cc
diff --git a/cc/test/test_context_support.cc b/cc/test/test_context_support.cc
index 7a47780e4d56369ffc6519477a2c33ff643616f3..a6aa09ce38c664b7fcb5f7600e1bdce54b4a4606 100644
--- a/cc/test/test_context_support.cc
+++ b/cc/test/test_context_support.cc
@@ -91,18 +91,4 @@ uint64_t TestContextSupport::ShareGroupTracingGUID() const {
 void TestContextSupport::SetErrorMessageCallback(
     const base::Callback<void(const char*, int32_t)>& callback) {}
 
-void TestContextSupport::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 TestContextSupport::AnyClientsVisible() const {
-  return !visible_clients_.empty();
-}
-
 }  // namespace cc