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

mojo/public/cpp/bindings/sync_handle_registry.h

Index: mojo/public/cpp/bindings/sync_handle_registry.h
diff --git a/mojo/public/cpp/bindings/sync_handle_registry.h b/mojo/public/cpp/bindings/sync_handle_registry.h
index 6c0701ef6f49cc5754089ba845cf9fd94c17f1fa..b5415af80dfb64fa20b453b14262e1cc40264a7f 100644
--- a/mojo/public/cpp/bindings/sync_handle_registry.h
+++ b/mojo/public/cpp/bindings/sync_handle_registry.h
@@ -11,6 +11,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread_checker.h"
+#include "mojo/public/cpp/bindings/bindings_export.h"
 #include "mojo/public/cpp/system/core.h"
 
 namespace mojo {
@@ -19,7 +20,8 @@ namespace mojo {
 // be watched together.
 //
 // This class is not thread safe.
-class SyncHandleRegistry : public base::RefCounted<SyncHandleRegistry> {
+class MOJO_CPP_BINDINGS_EXPORT SyncHandleRegistry
+    : public base::RefCounted<SyncHandleRegistry> {
  public:
   // Returns a thread-local object.
   static scoped_refptr<SyncHandleRegistry> current();