[fuchsia] Update zx_clock_get_new -> zx_clock_get

The call was renamed in	Fuchsia, the transitional *_new	variant	is
going to be removed soon.

Bug: chromium:977753
Change-Id: I3734cc36a15635dce4dc00d07917879761dec0f5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1676610
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62365}

src/base/platform/platform-fuchsia.cc

@@ -152,7 +152,7 @@ int OS::GetUserTime(uint32_t* secs, uint32_t* usecs) {
   const auto kMicrosPerSecond = 1000000ULL;
   zx_time_t nanos_since_thread_started;
   zx_status_t status =
-      zx_clock_get_new(ZX_CLOCK_THREAD, &nanos_since_thread_started);
+      zx_clock_get(ZX_CLOCK_THREAD, &nanos_since_thread_started);
   if (status != ZX_OK) {
     return -1;
   }