[Sync] Convert sync to a static library.

components/sync/js/sync_js_controller.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SYNC_JS_SYNC_JS_CONTROLLER_H_
 #define COMPONENTS_SYNC_JS_SYNC_JS_CONTROLLER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/base/weak_handle.h"
 #include "components/sync/js/js_controller.h"
 #include "components/sync/js/js_event_handler.h"
 
 namespace syncer {
 
 class JsBackend;
 
 // A class that mediates between the sync JsEventHandlers and the sync
 // JsBackend.
-class SYNC_EXPORT SyncJsController
-    : public JsController,
-      public JsEventHandler,
-      public base::SupportsWeakPtr<SyncJsController> {
+class SyncJsController : public JsController,
+                         public JsEventHandler,
+                         public base::SupportsWeakPtr<SyncJsController> {
  public:
   SyncJsController();
 
   ~SyncJsController() override;
 
   // Sets the backend to route all messages to (if initialized).
   // Sends any queued-up messages if |backend| is initialized.
   void AttachJsBackend(const WeakHandle<JsBackend>& js_backend);
 
   // JsController implementation.
@@ skipping 11 matching lines @@
 
   WeakHandle<JsBackend> js_backend_;
   base::ObserverList<JsEventHandler> js_event_handlers_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncJsController);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_JS_SYNC_JS_CONTROLLER_H_