SF: Complete mode change immediately if refresh is not required

Bug: 190982486
Test: atest libsurfaceflinger_unittest
Change-Id: I4be91274c6570c5e9304098d5d6c3d30c41c4e6e
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 53cbcab..cdec3c7 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -660,8 +660,7 @@
     // Sets the desired active mode bit. It obtains the lock, and sets mDesiredActiveMode.
     void setDesiredActiveMode(const ActiveModeInfo& info) REQUIRES(mStateLock);
     status_t setActiveModeFromBackdoor(const sp<IBinder>& displayToken, int id);
-    // Once HWC has returned the present fence, this sets the active mode and a new refresh
-    // rate in SF.
+    // Sets the active mode and a new refresh rate in SF.
     void updateInternalStateWithChangedMode() REQUIRES(mStateLock);
     // Calls to setActiveMode on the main thread if there is a pending mode change
     // that needs to be applied.