Add SharedWorkerServiceImpl::CheckWorkerDependency().

content/browser/message_port_message_filter.h

Index: content/browser/message_port_message_filter.h
diff --git a/content/browser/message_port_message_filter.h b/content/browser/message_port_message_filter.h
index 0dd38c94e6c04da97d2e334aa2f7402728db5836..5cc191ec934e9e208404ded30a215abe35ea49b7 100644
--- a/content/browser/message_port_message_filter.h
+++ b/content/browser/message_port_message_filter.h
@@ -6,13 +6,14 @@
 #define CONTENT_BROWSER_MESSAGE_PORT_MESSAGE_FILTER_H_
 
 #include "base/callback.h"
+#include "content/common/content_export.h"
 #include "content/public/browser/browser_message_filter.h"
 
 namespace content {
 
 // Filter for MessagePort related IPC messages (creating and destroying a
 // MessagePort, sending a message via a MessagePort etc).
-class MessagePortMessageFilter : public BrowserMessageFilter {
+class CONTENT_EXPORT MessagePortMessageFilter : public BrowserMessageFilter {
  public:
   typedef base::Callback<int(void)> NextRoutingIDCallback;
 
@@ -28,12 +29,14 @@ class MessagePortMessageFilter : public BrowserMessageFilter {
 
   int GetNextRoutingID();
 
+ protected:
+  // This is protected, so we can define sub classes for testing.
+  virtual ~MessagePortMessageFilter();
+
  private:
   friend class BrowserThread;
   friend class base::DeleteHelper<MessagePortMessageFilter>;
 
-  virtual ~MessagePortMessageFilter();
-
   // Message handlers.
   void OnCreateMessagePort(int* route_id, int* message_port_id);