Credential Manager: Migrate to WebView client-based approach.

Source/modules/credentialmanager/CredentialManagerClient.h

Index: Source/modules/credentialmanager/CredentialManagerClient.h
diff --git a/Source/modules/credentialmanager/CredentialManagerClient.h b/Source/modules/credentialmanager/CredentialManagerClient.h
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+++ b/Source/modules/credentialmanager/CredentialManagerClient.h
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+// 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 CredentialManagerClient_h
+#define CredentialManagerClient_h
+
+#include "platform/Supplementable.h"
+#include "public/platform/WebCredentialManagerClient.h"
+#include "public/platform/WebVector.h"
+
+namespace blink {
+
+class KURL;
+class Page;
+class WebCredential;
+class WebURL;
+
+// CredentialManagerClient lives as a supplement to Page, and wraps the embedder-provided
+// WebCredentialManagerClient's methods to make them visible to the bindings code.
+class CredentialManagerClient FINAL : public NoBaseWillBeGarbageCollected<CredentialManagerClient>, public WillBeHeapSupplement<Page> {
+    WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(CredentialManagerClient);
+public:
+    explicit CredentialManagerClient(WebCredentialManagerClient*);
+    virtual ~CredentialManagerClient();
+
+    static const char* supplementName();
+    static CredentialManagerClient* from(Page*);
+
+    // Ownership of the callback is transferred to the callee for each of
+    // the following methods.
+    virtual void dispatchFailedSignIn(const WebCredential&, WebCredentialManagerClient::NotificationCallbacks*);
+    virtual void dispatchSignedIn(const WebCredential&, WebCredentialManagerClient::NotificationCallbacks*);
+    virtual void dispatchSignedOut(WebCredentialManagerClient::NotificationCallbacks*);
+    virtual void dispatchRequest(bool zeroClickOnly, const WebVector<WebURL>& federations, WebCredentialManagerClient::RequestCallbacks*);
+
+private:
+    WebCredentialManagerClient* m_client;
+};
+
+void provideCredentialManagerClientTo(Page&, CredentialManagerClient*);
+
+} // namespace blink
+
+#endif // CredentialManagerClient_h
+