Fix nacl build.

TBR=ppi@chromium.org

Review URL: https://codereview.chromium.org/960913002
diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index 7c06e59..ea88ff5 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -121,7 +121,6 @@
 }
 
 # TODO(dpranke): Remove these asserts when os and cpu_arch are removed.
-assert(current_cpu == cpu_arch)
 assert(current_os == os)
 
 # =============================================================================