Make mojo_system static and mojo_system_impl a component, never use both

mojo/common/test/run_all_perftests.cc

Index: mojo/common/test/run_all_perftests.cc
diff --git a/mojo/common/test/run_all_perftests.cc b/mojo/common/test/run_all_perftests.cc
index b5032a67cca3dc3420e82ed4548658599ee28f7b..757247175668d630d1f0bddae435dac068340d12 100644
--- a/mojo/common/test/run_all_perftests.cc
+++ b/mojo/common/test/run_all_perftests.cc
@@ -8,7 +8,6 @@
 #include "mojo/public/tests/test_support_private.h"
 
 int main(int argc, char** argv) {
-  mojo::embedder::Init();
   mojo::test::TestSupport::Init(new mojo::test::TestSupportImpl());
   return base::PerfTestSuite(argc, argv).Run();
 }