Fix heapcheck errors

content/browser/streams/stream_context.h

Index: content/browser/streams/stream_context.h
diff --git a/content/browser/streams/stream_context.h b/content/browser/streams/stream_context.h
index b4c6d307fa50484ef241cb0805d0cb8c998f9e29..7b8adcbdea8edf36888d03465e2e010dc1dd03e4 100644
--- a/content/browser/streams/stream_context.h
+++ b/content/browser/streams/stream_context.h
@@ -13,6 +13,7 @@
 namespace content {
 class BrowserContext;
 class StreamRegistry;
+struct StreamContextDeleter;
 
 // A context class that keeps track of StreamRegistry used by the chrome.
 // There is an instance associated with each BrowserContext. There could be
@@ -23,7 +24,7 @@ class StreamRegistry;
 // the IO thread (unless specifically called out in doc comments).
 class StreamContext
     : public base::RefCountedThreadSafe<StreamContext,
-                                        BrowserThread::DeleteOnIOThread> {
+                                        StreamContextDeleter> {
  public:
   StreamContext();
 
@@ -38,11 +39,21 @@ class StreamContext
 
  private:
   friend class base::DeleteHelper<StreamContext>;
-  friend struct BrowserThread::DeleteOnThread<BrowserThread::IO>;
+  friend class base::RefCountedThreadSafe<StreamContext,
+                                          StreamContextDeleter>;
+  friend struct StreamContextDeleter;
+
+  void DeleteOnCorrectThread() const;
 
   scoped_ptr<StreamRegistry> registry_;
 };
 
+struct StreamContextDeleter {
+  static void Destruct(const StreamContext* context) {
+    context->DeleteOnCorrectThread();
+  }
+};
+
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_STREAMS_STREAM_CONTEXT_H_