Reenable libaom decoder by default

Bug: webrtc:11404
Change-Id: I165ce3b88d35b58b3f878246c77ab48c36cc9ddc
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/170636
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30823}
diff --git a/.gn b/.gn
index 95773f8..807c0a1 100644
--- a/.gn
+++ b/.gn
@@ -72,7 +72,7 @@
   # for unittests, it can be disabled (see third_party/libyuv/BUILD.gn)
   libyuv_use_gflags = false
 
-  enable_libaom_decoder = false
+  enable_libaom = true
 
   gtest_enable_absl_printers = true
 }