blink: permissions: add plumbing to revoke permissions

Source/modules/permissions/PermissionCallback.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 PermissionQueryCallback_h
-#define PermissionQueryCallback_h
+#ifndef PermissionCallback_h
+#define PermissionCallback_h
 
 #include "platform/heap/Handle.h"
 #include "public/platform/WebCallbacks.h"
 #include "public/platform/modules/permissions/WebPermissionStatus.h"
 #include "public/platform/modules/permissions/WebPermissionType.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
 class ScriptPromiseResolver;
 
-// PermissionQueryCallback is an implementation of WebPermissionQueryCallbacks
+// PermissionQueryCallback is an implementation of WebPermissionCallbacks
 // that will resolve the underlying promise depending on the result passed to
 // the callback. It takes a WebPermissionType in its constructor and will pass
 // it to the PermissionStatus.
-class PermissionQueryCallback final
+class PermissionCallback final
     : public WebCallbacks<WebPermissionStatus, void> {
 public:
-    explicit PermissionQueryCallback(PassRefPtr<ScriptPromiseResolver>, WebPermissionType);

[mlamouri (slow - plz ping), 2015/07/17 13:16:18]

nit: can you remove explicit as long as you are here. It seems that this ctor
has two arguments now.

[Lalit Maganti, 2015/07/17 13:47:35]

Done. I didn't actually know what the explicit keyword does but I looked it up
and I'm in shock that implicit constructor calling a C++ "feature".

[mlamouri (slow - plz ping), 2015/07/20 14:14:12]

The joys of backward compatibility :)

-    ~PermissionQueryCallback() override;
+    explicit PermissionCallback(PassRefPtr<ScriptPromiseResolver>, WebPermissionType);
+    ~PermissionCallback() override;
 
     void onSuccess(WebPermissionStatus*) override;
     void onError() override;
 
 private:
     RefPtr<ScriptPromiseResolver> m_resolver;
     WebPermissionType m_permissionType;
 
-    WTF_MAKE_NONCOPYABLE(PermissionQueryCallback);
+    WTF_MAKE_NONCOPYABLE(PermissionCallback);
 };
 
 } // namespace blink
 
-#endif // PermissionQueryCallback_h
+#endif // PermissionCallback_h