Mojo: Add the beginnings of a proper embedder API.

mojo/common/test/run_all_unittests.cc

Index: mojo/common/test/run_all_unittests.cc
diff --git a/mojo/common/test/run_all_unittests.cc b/mojo/common/test/run_all_unittests.cc
index 56e0933f7bd87cddeae8a176e45cb2f884d04323..71783a8625972e0b490534f48b0a785fab1d3272 100644
--- a/mojo/common/test/run_all_unittests.cc
+++ b/mojo/common/test/run_all_unittests.cc
@@ -5,12 +5,12 @@
 #include "base/bind.h"
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/test_suite.h"
-#include "mojo/system/core_impl.h"
+#include "mojo/system/embedder.h"
 
 int main(int argc, char** argv) {
   base::TestSuite test_suite(argc, argv);
 
-  mojo::system::CoreImpl::Init();
+  mojo::embedder::Init();
 
   return base::LaunchUnitTests(
       argc, argv, base::Bind(&base::TestSuite::Run,