Remove const std::string return by std::string

chrome/browser/chromeos/options/vpn_config_view.h

Index: chrome/browser/chromeos/options/vpn_config_view.h
diff --git a/chrome/browser/chromeos/options/vpn_config_view.h b/chrome/browser/chromeos/options/vpn_config_view.h
index a316f1caf56da5a4c97933809962771d87a7ad57..1d5f2c42bf695e51f2b5cd0cbb8a05027c95cd9e 100644
--- a/chrome/browser/chromeos/options/vpn_config_view.h
+++ b/chrome/browser/chromeos/options/vpn_config_view.h
@@ -117,14 +117,14 @@ class VPNConfigView : public ChildNetworkConfigView,
       PassphraseTextfield* textfield) const;
 
   // Convenience methods to get text from input field or cached VirtualNetwork.
-  const std::string GetService() const;
-  const std::string GetServer() const;
-  const std::string GetPSKPassphrase() const;
-  const std::string GetUsername() const;
-  const std::string GetUserPassphrase() const;
-  const std::string GetOTP() const;
-  const std::string GetGroupName() const;
-  const std::string GetServerCACertPEM() const;
+  std::string GetService() const;
+  std::string GetServer() const;
+  std::string GetPSKPassphrase() const;
+  std::string GetUsername() const;
+  std::string GetUserPassphrase() const;
+  std::string GetOTP() const;
+  std::string GetGroupName() const;
+  std::string GetServerCACertPEM() const;
   bool GetSaveCredentials() const;
   int GetProviderTypeIndex() const;
   std::string GetProviderTypeString() const;