cc: Remove unused scheduler setting.

cc/scheduler/scheduler_state_machine.cc

Index: cc/scheduler/scheduler_state_machine.cc
diff --git a/cc/scheduler/scheduler_state_machine.cc b/cc/scheduler/scheduler_state_machine.cc
index 4a9a2e0991914bfea1843ceea75f23397ea56d63..91ae485850381b5ce41b3eb509a11d06deb5ba09 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -309,12 +309,7 @@ bool SchedulerStateMachine::ShouldBeginCompositorFrameSinkCreation() const {
 
   // We only want to start output surface initialization after the
   // previous commit is complete.
-  // We make an exception if the embedder explicitly allows beginning output
-  // surface creation while the previous commit has not been aborted. This
-  // assumes that any state passed from the client during the commit will not be
-  // tied to the output surface.
-  if (begin_main_frame_state_ != BEGIN_MAIN_FRAME_STATE_IDLE &&
-      settings_.abort_commit_before_compositor_frame_sink_creation) {
+  if (begin_main_frame_state_ != BEGIN_MAIN_FRAME_STATE_IDLE) {
     return false;
   }
 
@@ -713,11 +708,7 @@ void SchedulerStateMachine::WillBeginCompositorFrameSinkCreation() {
   // The following DCHECKs make sure we are in the proper quiescent state.
   // The pipeline should be flushed entirely before we start output
   // surface creation to avoid complicated corner cases.
-
-  // We allow output surface creation while the previous commit has not been
-  // aborted if the embedder explicitly allows it.
-  DCHECK(!settings_.abort_commit_before_compositor_frame_sink_creation ||
-         begin_main_frame_state_ == BEGIN_MAIN_FRAME_STATE_IDLE);
+  DCHECK(begin_main_frame_state_ == BEGIN_MAIN_FRAME_STATE_IDLE);
   DCHECK(!has_pending_tree_);
   DCHECK(!active_tree_needs_first_draw_);
 }