Fixing race between ~AsyncInvoker and ~AsyncClosure.

webrtc/base/asyncinvoker-inl.h

Index: webrtc/base/asyncinvoker-inl.h
diff --git a/webrtc/base/asyncinvoker-inl.h b/webrtc/base/asyncinvoker-inl.h
index 93e7671a9531034e34727a08df593543fbdebbfb..9809fb9e6eae34d81290c78a885cfe572e875e59 100644
--- a/webrtc/base/asyncinvoker-inl.h
+++ b/webrtc/base/asyncinvoker-inl.h
@@ -28,7 +28,7 @@ class AsyncInvoker;
 // on the calling thread if necessary.
 class AsyncClosure {
  public:
-  explicit AsyncClosure(AsyncInvoker* invoker) : invoker_(invoker) {}
+  explicit AsyncClosure(AsyncInvoker* invoker);
   virtual ~AsyncClosure();
   // Runs the asynchronous task, and triggers a callback to the calling
   // thread if needed. Should be called from the target thread.