[HWUI] Remove nanosecond conversion from duration queries.

Now that they return nanoseconds, there's no reason to lose precision.

Bug: 137012798
Test: builds
Change-Id: I52ca20cb010b4f1829596e0a765b7013ae3665ca
diff --git a/libs/hwui/renderthread/CanvasContext.cpp b/libs/hwui/renderthread/CanvasContext.cpp
index 684dc22..30cc007 100644
--- a/libs/hwui/renderthread/CanvasContext.cpp
+++ b/libs/hwui/renderthread/CanvasContext.cpp
@@ -491,9 +491,9 @@
                 swap.dequeueDuration = 0;
             } else {
                 swap.dequeueDuration =
-                        us2ns(ANativeWindow_getLastDequeueDuration(mNativeSurface.get()));
+                        ANativeWindow_getLastDequeueDuration(mNativeSurface.get());
             }
-            swap.queueDuration = us2ns(ANativeWindow_getLastQueueDuration(mNativeSurface.get()));
+            swap.queueDuration = ANativeWindow_getLastQueueDuration(mNativeSurface.get());
         } else {
             swap.dequeueDuration = 0;
             swap.queueDuration = 0;