Enable building app_shell_unittests on Mac.

Looks like it builds on Mac now.

Tested on Mac with the following command lines:

$ gn gen out-gn/Release --args='is_debug=false is_component_build=false symbol_level=1'
$ ninja -C out-gn/Release app_shell_unittests

BUG=431177
R=dpranke@chromium.org

Review URL: https://codereview.chromium.org/1418513013

Cr-Commit-Position: refs/heads/master@{#356146}

1 files changed, 1 insertions, 2 deletions

diff --git a/BUILD.gn b/BUILD.gn
index c46dc2e..e460d21 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -194,8 +194,7 @@ group("both_gn_and_gyp") {
 
   deps += root_extra_deps
 
-  if (enable_extensions && !is_mac) {
-    # TODO(GYP): Get this working on the mac?
+  if (enable_extensions) {
     deps += [ "//extensions/shell:app_shell_unittests" ]
   }