Update {virtual,override} to follow C++11 style in device.

device/hid/hid_connection_win.h

Index: device/hid/hid_connection_win.h
diff --git a/device/hid/hid_connection_win.h b/device/hid/hid_connection_win.h
index 5830c21528cb308cfe0e873a67995c7cde68f501..b1c4bf845ab532485a2cbdd0c0844c7c515f7fc2 100644
--- a/device/hid/hid_connection_win.h
+++ b/device/hid/hid_connection_win.h
@@ -25,20 +25,19 @@ class HidConnectionWin : public HidConnection {
   friend class HidServiceWin;
   friend struct PendingHidTransfer;
 
-  ~HidConnectionWin();
+  ~HidConnectionWin() override;
 
   // HidConnection implementation.
-  virtual void PlatformClose() override;
-  virtual void PlatformRead(const ReadCallback& callback) override;
-  virtual void PlatformWrite(scoped_refptr<net::IOBuffer> buffer,
-                             size_t size,
-                             const WriteCallback& callback) override;
-  virtual void PlatformGetFeatureReport(uint8_t report_id,
-                                        const ReadCallback& callback) override;
-  virtual void PlatformSendFeatureReport(
-      scoped_refptr<net::IOBuffer> buffer,
-      size_t size,
-      const WriteCallback& callback) override;
+  void PlatformClose() override;
+  void PlatformRead(const ReadCallback& callback) override;
+  void PlatformWrite(scoped_refptr<net::IOBuffer> buffer,
+                     size_t size,
+                     const WriteCallback& callback) override;
+  void PlatformGetFeatureReport(uint8_t report_id,
+                                const ReadCallback& callback) override;
+  void PlatformSendFeatureReport(scoped_refptr<net::IOBuffer> buffer,
+                                 size_t size,
+                                 const WriteCallback& callback) override;
 
   void OnReadComplete(scoped_refptr<net::IOBuffer> buffer,
                       const ReadCallback& callback,