Minor cleanup, following this[1] comment.

[1] crrev.com/c/2265704/5/third_party/blink/renderer/platform/scheduler/main_thread/agent_scheduling_strategy.cc#225

Change-Id: I1b8b653c4ffdaf6e9073afd02a9f90619bcfe771
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2269380Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Kouhei Ueno <kouhei@chromium.org>
Commit-Queue: Tal Pressman <talp@chromium.org>
Auto-Submit: Tal Pressman <talp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782842}

third_party/blink/renderer/platform/scheduler/main_thread/agent_scheduling_strategy.cc

@@ -220,16 +220,14 @@ class TrackMainFrameSignal final : public AgentSchedulingStrategy {
       return ShouldUpdatePolicy::kYes;
     }
 
-    if (signal_ == PerAgentSignal::kDelayOnly) {
+    if (signal_ == PerAgentSignal::kDelayOnly)
       delegate_.OnSetTimer(frame_scheduler, delay_);
-    }
+    else if (signal_ == PerAgentSignal::kFirstMeaningfulPaint)
+      SetWaitingForInput(true);
 
     main_frames_.insert(&frame_scheduler);
     main_frames_waiting_for_signal_.insert(&frame_scheduler);
 
-    if (signal_ == PerAgentSignal::kFirstMeaningfulPaint)
-      SetWaitingForInput(true);
-
     return ShouldUpdatePolicy::kYes;
   }