SF: remove changeRefreshRateLocked

Remove changeRefreshRateLocked which is used only in one place.

Bug: 190982486
Test: presubmit
Change-Id: Ia16b90c46c84c491caf8fff8dfe8f2f0b6335bbd
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 09cf5ce..22348b4 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -648,7 +648,7 @@
 
     // Toggles hardware VSYNC by calling into HWC.
     void setVsyncEnabled(bool) override;
-    // Initiates a refresh rate change to be applied on invalidate.
+    // Initiates a refresh rate change to be applied on commit.
     void changeRefreshRate(const Scheduler::RefreshRate&, Scheduler::ModeEvent) override;
     // Called when kernel idle timer has expired. Used to update the refresh rate overlay.
     void kernelTimerChanged(bool expired) override;
@@ -951,10 +951,6 @@
         getHwComposer().setVsyncEnabled(id, enabled);
     }
 
-    // Sets the refresh rate by switching active configs, if they are available for
-    // the desired refresh rate.
-    void changeRefreshRateLocked(const RefreshRate&, Scheduler::ModeEvent) REQUIRES(mStateLock);
-
     struct FenceWithFenceTime {
         sp<Fence> fence = Fence::NO_FENCE;
         std::shared_ptr<FenceTime> fenceTime = FenceTime::NO_FENCE;