Turn //mojo/public/cpp/bindings and //mojo/public/cpp/system into components

mojo/public/cpp/bindings/associated_group_controller.h

Index: mojo/public/cpp/bindings/associated_group_controller.h
diff --git a/mojo/public/cpp/bindings/associated_group_controller.h b/mojo/public/cpp/bindings/associated_group_controller.h
index 258cfa4568adb4b06f993c2f38a1b79bc9582e50..42849df81e1c09d0d4180f321371b9360dabc0c3 100644
--- a/mojo/public/cpp/bindings/associated_group_controller.h
+++ b/mojo/public/cpp/bindings/associated_group_controller.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
+#include "mojo/public/cpp/bindings/bindings_export.h"
 #include "mojo/public/cpp/bindings/interface_id.h"
 #include "mojo/public/cpp/bindings/scoped_interface_endpoint_handle.h"
 
@@ -20,8 +21,8 @@ class InterfaceEndpointClient;
 class InterfaceEndpointController;
 
 // An internal interface used to manage endpoints within an associated group.
-class AssociatedGroupController :
-    public base::RefCountedThreadSafe<AssociatedGroupController> {
+class MOJO_CPP_BINDINGS_EXPORT AssociatedGroupController
+    : public base::RefCountedThreadSafe<AssociatedGroupController> {
  public:
   // Creates a pair of interface endpoint handles. The method generates a new
   // interface ID and assigns it to the two handles. |local_endpoint| is used