Deleted OS_WIN and all Windows specific files from base.

base/synchronization/waitable_event_watcher.h

Index: base/synchronization/waitable_event_watcher.h
diff --git a/base/synchronization/waitable_event_watcher.h b/base/synchronization/waitable_event_watcher.h
index eb51effa49932cf250828a2ecc447f9a9c598e71..048020f2fa1b390fc1c0e409891e710ef962a646 100644
--- a/base/synchronization/waitable_event_watcher.h
+++ b/base/synchronization/waitable_event_watcher.h
@@ -6,15 +6,10 @@
 #define BASE_SYNCHRONIZATION_WAITABLE_EVENT_WATCHER_H_
 
 #include "base/base_export.h"
-#include "build/build_config.h"
-
-#if defined(OS_WIN)
-#include "base/win/object_watcher.h"
-#else
 #include "base/callback.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
-#endif
+#include "build/build_config.h"
 
 namespace base {
 
@@ -59,11 +54,7 @@ class WaitableEvent;
 // it with a Watcher. It will act as if the event was never signaled.
 
 class BASE_EXPORT WaitableEventWatcher
-#if defined(OS_WIN)
-    : public win::ObjectWatcher::Delegate {
-#else
     : public MessageLoop::DestructionObserver {
-#endif
  public:
   typedef Callback<void(WaitableEvent*)> EventCallback;
   WaitableEventWatcher();
@@ -91,10 +82,6 @@ class BASE_EXPORT WaitableEventWatcher
   const EventCallback& callback() const { return callback_; }
 
  private:
-#if defined(OS_WIN)
-  void OnObjectSignaled(HANDLE h) override;
-  win::ObjectWatcher watcher_;
-#else
   // Implementation of MessageLoop::DestructionObserver
   void WillDestroyCurrentMessageLoop() override;
 
@@ -103,7 +90,6 @@ class BASE_EXPORT WaitableEventWatcher
   AsyncWaiter* waiter_;
   base::Closure internal_callback_;
   scoped_refptr<WaitableEvent::WaitableEventKernel> kernel_;
-#endif
 
   WaitableEvent* event_;
   EventCallback callback_;