[Fuchsia] Re-enable accelerated canvas.

Bug mentioned was fixed, should be able to reenable canvas acceleration now.

Bug: 1058255,1019212
Change-Id: I6508a2591ef30c207664a205b1ad6d4c21839311
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2088215
Commit-Queue: Chong Gu <chonggu@google.com>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746887}

fuchsia/engine/context_provider_impl.cc

@@ -462,9 +462,6 @@ void ContextProviderImpl::Create(
             .value_or(false);
     if (force_protected_video_buffers) {
       launch_command.AppendSwitch(switches::kForceProtectedVideoOutputBuffers);
-      // TODO(crbug.com/1019212): We observed flicker and buffer issues when
-      // using accelerated canvas with protected memory.
-      launch_command.AppendSwitch(switches::kDisableAccelerated2dCanvas);
     }
   }