Add SharedWorkerServiceImpl::CheckWorkerDependency().

content/browser/shared_worker/shared_worker_message_filter.h

Index: content/browser/shared_worker/shared_worker_message_filter.h
diff --git a/content/browser/shared_worker/shared_worker_message_filter.h b/content/browser/shared_worker/shared_worker_message_filter.h
index 285f8211d7d7611ca30d2d9d4518c6d578b5178f..7ca41c286e33758684e4b86949178efe031e9eb4 100644
--- a/content/browser/shared_worker/shared_worker_message_filter.h
+++ b/content/browser/shared_worker/shared_worker_message_filter.h
@@ -6,6 +6,7 @@
 #define CONTENT_BROWSER_SHARED_WORKER_SHARED_WORKER_MESSAGE_FILTER_H_
 
 #include "content/browser/worker_host/worker_storage_partition.h"
+#include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
 
 class GURL;
@@ -17,7 +18,7 @@ class ResourceContext;
 
 // If "enable-embedded-shared-worker" is set this class will be used instead of
 // WorkerMessageFilter.
-class SharedWorkerMessageFilter : public BrowserMessageFilter {
+class CONTENT_EXPORT SharedWorkerMessageFilter : public BrowserMessageFilter {
  public:
   SharedWorkerMessageFilter(int render_process_id,
                             ResourceContext* resource_context,
@@ -36,9 +37,11 @@ class SharedWorkerMessageFilter : public BrowserMessageFilter {
     return message_port_message_filter_;
   }
 
- private:
+ protected:
+  // This is protected, so we can define sub classes for testing.
   virtual ~SharedWorkerMessageFilter();
 
+ private:
   // Message handlers.
   void OnCreateWorker(const ViewHostMsg_CreateWorker_Params& params,
                       int* route_id);