WebRTCCertificateGenerator should not use std::string.

third_party/WebKit/public/platform/WebRTCCertificate.h

 // Copyright 2015 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 WebRTCCertificate_h
 #define WebRTCCertificate_h
 
 #include "public/platform/WebRTCKeyParams.h"
+#include "public/platform/WebString.h"
 
 #include <memory>
 
 namespace blink {
 
 // Corresponds to |rtc::RTCCertificatePEM| in WebRTC.
 // See |WebRTCCertificate::toPEM| and |WebRTCCertificateGenerator::fromPEM|.
 class WebRTCCertificatePEM {
 public:
-    WebRTCCertificatePEM(std::string privateKey, std::string certificate)
-        : m_privateKey(privateKey), m_certificate(certificate)
+    WebRTCCertificatePEM(WebString privateKey, WebString certificate)
+        : m_privateKey(privateKey)
+        , m_certificate(certificate)
     {
     }
 
-    const std::string& privateKey() const
-    {
-        return m_privateKey;
-    }
-    const std::string& certificate() const
-    {
-        return m_certificate;
-    }
+    WebString privateKey() const { return m_privateKey; }
+    WebString certificate() const { return m_certificate; }
 
 private:
-    std::string m_privateKey;
-    std::string m_certificate;
+    WebString m_privateKey;
+    WebString m_certificate;
 };
 
 // WebRTCCertificate is an interface defining what Blink needs to know about certificates,
 // hiding Chromium and WebRTC layer implementation details. It is possible to create
 // shallow copies of the WebRTCCertificate. When all copies are destroyed, the
 // implementation specific data must be freed. WebRTCCertificate objects thus act as
 // references to the reference counted internal data.
 class WebRTCCertificate {
 public:
     WebRTCCertificate() = default;
@@ skipping 14 matching lines @@
     virtual bool equals(const WebRTCCertificate& other) const = 0;
 
 private:
     WebRTCCertificate(const WebRTCCertificate&) = delete;
     WebRTCCertificate& operator=(const WebRTCCertificate&) = delete;
 };
 
 } // namespace blink
 
 #endif // WebRTCCertificate_h