chrome: Cleanup class/struct forward declarations

chrome/browser/devtools/device/usb/android_usb_socket.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_DEVTOOLS_DEVICE_USB_ANDROID_USB_SOCKET_H_
 #define CHROME_BROWSER_DEVTOOLS_DEVICE_USB_ANDROID_USB_SOCKET_H_
 
 #include <stdint.h>
 
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/devtools/device/usb/android_usb_device.h"
 #include "net/base/ip_endpoint.h"
 #include "net/log/net_log_with_source.h"
 #include "net/socket/stream_socket.h"
 
-namespace base {
-class MessageLoop;
-}
-
 class AndroidUsbSocket : public net::StreamSocket,
                          public base::NonThreadSafe {
  public:
   AndroidUsbSocket(scoped_refptr<AndroidUsbDevice> device,
                    uint32_t socket_id,
                    const std::string& command,
                    base::Closure delete_callback);
   ~AndroidUsbSocket() override;
 
   void HandleIncoming(std::unique_ptr<AdbMessage> message);
@@ skipping 45 matching lines @@
   net::CompletionCallback connect_callback_;
   net::CompletionCallback read_callback_;
   net::CompletionCallback write_callback_;
   base::Closure delete_callback_;
   base::WeakPtrFactory<AndroidUsbSocket> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AndroidUsbSocket);
 };
 
 #endif  // CHROME_BROWSER_DEVTOOLS_DEVICE_USB_ANDROID_USB_SOCKET_H_