Mojo: Add the beginnings of a proper embedder API.

mojo/shell/context.cc

Index: mojo/shell/context.cc
diff --git a/mojo/shell/context.cc b/mojo/shell/context.cc
index 6eb8f0b517232a553b0a75f3066206fb2a4619bd..2cb8a54fa167cd1c8e761afde6a209730e69933b 100644
--- a/mojo/shell/context.cc
+++ b/mojo/shell/context.cc
@@ -6,7 +6,7 @@
 
 #include "mojo/shell/dynamic_service_loader.h"
 #include "mojo/shell/network_delegate.h"
-#include "mojo/system/core_impl.h"
+#include "mojo/system/embedder.h"
 
 namespace mojo {
 namespace shell {
@@ -19,7 +19,7 @@ Context::Context()
               task_runners_.cache_runner(),
               scoped_ptr<net::NetworkDelegate>(new NetworkDelegate()),
               storage_.profile_path()) {
-  system::CoreImpl::Init();
+  embedder::Init();
   BindingsSupport::Set(&bindings_support_impl_);
   dynamic_service_loader_.reset(new DynamicServiceLoader(this));
   service_manager_.set_default_loader(dynamic_service_loader_.get());