Mojo: Make tests under mojo/public use our own run_all_unittests.cc.

mojo/public/tests/system_core_perftest.cc

Index: mojo/public/tests/system_core_perftest.cc
diff --git a/mojo/public/tests/system_core_perftest.cc b/mojo/public/tests/system_core_perftest.cc
index 8ee7ceb2cc7be1e8015c180a0bae534f84fe9e5b..c6a0508914863499cac6c72f9f7da34b64269f05 100644
--- a/mojo/public/tests/system_core_perftest.cc
+++ b/mojo/public/tests/system_core_perftest.cc
@@ -8,11 +8,12 @@
 #include "base/bind.h"
 #include "base/logging.h"
 #include "mojo/public/tests/test_support.h"
+#include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 namespace {
 
-class SystemPerftest : public test::TestBase {
+class SystemPerftest : public testing::Test {
  public:
   SystemPerftest() {}
   virtual ~SystemPerftest() {}