Deleted OS_WIN and all Windows specific files from base.

base/async_socket_io_handler.h

Index: base/async_socket_io_handler.h
diff --git a/base/async_socket_io_handler.h b/base/async_socket_io_handler.h
index a22c29d907df6feb8e0bb12c4a27b105e47b4ecd..79def118f87ff038bb42262e84b02c48b49c3e50 100644
--- a/base/async_socket_io_handler.h
+++ b/base/async_socket_io_handler.h
@@ -46,12 +46,7 @@ namespace base {
 //
 class BASE_EXPORT AsyncSocketIoHandler
     : public NON_EXPORTED_BASE(base::NonThreadSafe),
-// The message loop callback interface is different based on platforms.
-#if defined(OS_WIN)
-      public NON_EXPORTED_BASE(base::MessageLoopForIO::IOHandler) {
-#else
       public NON_EXPORTED_BASE(base::MessageLoopForIO::Watcher) {
-#endif
  public:
   AsyncSocketIoHandler();
   ~AsyncSocketIoHandler() override;
@@ -74,13 +69,8 @@ class BASE_EXPORT AsyncSocketIoHandler
   bool Read(char* buffer, int buffer_len);
 
  private:
-#if defined(OS_WIN)
-  // Implementation of IOHandler on Windows.
-  void OnIOCompleted(base::MessageLoopForIO::IOContext* context,
-                     DWORD bytes_transfered,
-                     DWORD error) override;
-#elif defined(OS_POSIX)
   // Implementation of base::MessageLoopForIO::Watcher.
+#if defined(OS_POSIX)
   void OnFileCanWriteWithoutBlocking(int socket) override {}
   void OnFileCanReadWithoutBlocking(int socket) override;
 
@@ -88,10 +78,7 @@ class BASE_EXPORT AsyncSocketIoHandler
 #endif
 
   base::SyncSocket::Handle socket_;
-#if defined(OS_WIN)
-  base::MessageLoopForIO::IOContext* context_;
-  bool is_pending_;
-#elif defined(OS_POSIX)
+#if defined(OS_POSIX)
   base::MessageLoopForIO::FileDescriptorWatcher socket_watcher_;
   // |pending_buffer_| and |pending_buffer_len_| are valid only between
   // Read() and OnFileCanReadWithoutBlocking().