Make empty_main work on clang ASAN.

Bug: chromium:811764
Change-Id: I2d41e6941135dc9bd23f840a0ed7d992b85afa95
Reviewed-on: https://chromium-review.googlesource.com/920992
Reviewed-by: Hans Wennborg <hans@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537629}

diff --git a/BUILD.gn b/BUILD.gn
index c4c6355..300325a 100644
--- a/BUILD.gn
+++ b/BUILD.gn

@@ -401,12 +401,9 @@
       "//net:quic_server",
       "//sandbox/linux:chrome_sandbox",
       "//sandbox/linux:sandbox_linux_unittests",
+      "//testing:empty_main",
     ]
 
-    if (!is_clang) {
-      deps += [ "//testing:empty_main" ]
-    }
-
     if (use_dbus) {
       deps += [
         "//dbus:dbus_test_server",