FBTF: Moves code to the headers.

base/waitable_event.h

Index: base/waitable_event.h
diff --git a/base/waitable_event.h b/base/waitable_event.h
index 0a826550a1c2e3b56ebc9442c89c9e900a0af3f1..6deb1876631ca249c8db9e25ca2a1f50a883a888 100644
--- a/base/waitable_event.h
+++ b/base/waitable_event.h
@@ -144,10 +144,8 @@ class WaitableEvent {
   struct WaitableEventKernel :
       public RefCountedThreadSafe<WaitableEventKernel> {
    public:
-    WaitableEventKernel(bool manual_reset, bool initially_signaled)
-        : manual_reset_(manual_reset),
-          signaled_(initially_signaled) {
-    }
+    WaitableEventKernel(bool manual_reset, bool initially_signaled);
+    virtual ~WaitableEventKernel();
 
     bool Dequeue(Waiter* waiter, void* tag);
 
@@ -157,6 +155,7 @@ class WaitableEvent {
     std::list<Waiter*> waiters_;
   };
 
+  struct WaitableEventKernel;
   scoped_refptr<WaitableEventKernel> kernel_;
 
   bool SignalAll();