Revert of TaskGraphRunner Group support

cc/raster/task_graph_runner_perftest.cc

Index: cc/raster/task_graph_runner_perftest.cc
diff --git a/cc/raster/task_graph_runner_perftest.cc b/cc/raster/task_graph_runner_perftest.cc
index 0df07578347f41d397fa779c922b8557ac578abd..f571d33d4e63450fff4a1dad51facf036f129c4b 100644
--- a/cc/raster/task_graph_runner_perftest.cc
+++ b/cc/raster/task_graph_runner_perftest.cc
@@ -230,13 +230,13 @@
     for (PerfTaskImpl::Vector::const_iterator it = leaf_tasks.begin();
          it != leaf_tasks.end();
          ++it) {
-      graph->nodes.push_back(TaskGraph::Node(it->get(), 0u, 0u, 0u));
+      graph->nodes.push_back(TaskGraph::Node(it->get(), 0u, 0u));
     }
 
     for (PerfTaskImpl::Vector::const_iterator it = tasks.begin();
-         it != tasks.end(); ++it) {
-      graph->nodes.push_back(
-          TaskGraph::Node(it->get(), 0u, 0u, leaf_tasks.size()));
+         it != tasks.end();
+         ++it) {
+      graph->nodes.push_back(TaskGraph::Node(it->get(), 0u, leaf_tasks.size()));
 
       for (PerfTaskImpl::Vector::const_iterator leaf_it = leaf_tasks.begin();
            leaf_it != leaf_tasks.end();
@@ -255,7 +255,7 @@
     for (PerfTaskImpl::Vector::const_iterator it = top_level_tasks.begin();
          it != top_level_tasks.end();
          ++it) {
-      graph->nodes.push_back(TaskGraph::Node(it->get(), 0u, 0u, tasks.size()));
+      graph->nodes.push_back(TaskGraph::Node(it->get(), 0u, tasks.size()));
     }
   }