Revert of MediaStreamSource: verify unlocked state when finalizing.

third_party/WebKit/Source/platform/mediastream/MediaStreamSource.h

Index: third_party/WebKit/Source/platform/mediastream/MediaStreamSource.h
diff --git a/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.h b/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.h
index e41f74b78283eb31b503dd865900976d0a596c76..fcb2fb2f8a4aee7a56a217249cb2f8620aad0054 100644
--- a/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.h
+++ b/third_party/WebKit/Source/platform/mediastream/MediaStreamSource.h
@@ -74,8 +74,6 @@ class PLATFORM_EXPORT MediaStreamSource final
                                    ReadyState = ReadyStateLive,
                                    bool requiresConsumer = false);
 
-  ~MediaStreamSource();
-
   const String& id() const { return m_id; }
   StreamType type() const { return m_type; }
   const String& name() const { return m_name; }