make content_shell and content_browsertests works with aura

content/test/content_test_launcher.cc

Index: content/test/content_test_launcher.cc
diff --git a/content/test/content_test_launcher.cc b/content/test/content_test_launcher.cc
index e9dc6a3ef73e6a5f886950119b11ca50c6283cda..efa0c7288c79cd27570645dccf1f099c6f2fa53a 100644
--- a/content/test/content_test_launcher.cc
+++ b/content/test/content_test_launcher.cc
@@ -132,10 +132,6 @@ class ContentTestLauncherDelegate : public test_launcher::TestLauncherDelegate {
 }  // namespace content
 
 int main(int argc, char** argv) {
-#if defined(USE_AURA)
-  LOG(INFO) << "content_browsertests not supported on aura yet.";
-  return 0;
-#endif
   content::ContentTestLauncherDelegate launcher_delegate;
   return test_launcher::LaunchTests(&launcher_delegate, argc, argv);
 }