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

mojo/public/cpp/bindings/sync_handle_watcher.h

Index: mojo/public/cpp/bindings/sync_handle_watcher.h
diff --git a/mojo/public/cpp/bindings/sync_handle_watcher.h b/mojo/public/cpp/bindings/sync_handle_watcher.h
index 36b796bf0d904343993882040c7c8eda65599316..eff73dd66e0718276e6f88f332769d36efbd3bb7 100644
--- a/mojo/public/cpp/bindings/sync_handle_watcher.h
+++ b/mojo/public/cpp/bindings/sync_handle_watcher.h
@@ -8,6 +8,7 @@
 #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/bindings/sync_handle_registry.h"
 #include "mojo/public/cpp/system/core.h"
 
@@ -25,7 +26,7 @@ namespace mojo {
 // associated endpoints on different threads.
 //
 // This class is not thread safe.
-class SyncHandleWatcher {
+class MOJO_CPP_BINDINGS_EXPORT SyncHandleWatcher {
  public:
   // Note: |handle| must outlive this object.
   SyncHandleWatcher(const Handle& handle,