Revert of Remove MediaStreamTrack.getSources().

third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.h

Index: third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.h
diff --git a/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.h b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.h
index ef8ebcfa4d212d02f764908d08bb728cd9d62ddd..fd6c1f24bfbc7b912db1070c3bdc36a83b456b1c 100644
--- a/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.h
+++ b/third_party/WebKit/Source/modules/mediastream/MediaStreamTrack.h
@@ -30,6 +30,7 @@
 #include "core/dom/ActiveDOMObject.h"
 #include "modules/EventTargetModules.h"
 #include "modules/ModulesExport.h"
+#include "modules/mediastream/SourceInfo.h"
 #include "platform/mediastream/MediaStreamDescriptor.h"
 #include "platform/mediastream/MediaStreamSource.h"
 #include "public/platform/WebMediaConstraints.h"
@@ -67,6 +68,9 @@
 
   String readyState() const;
 
+  static void getSources(ExecutionContext*,
+                         MediaStreamTrackSourcesCallback*,
+                         ExceptionState&);
   void stopTrack(ExceptionState&);
   virtual MediaStreamTrack* clone(ExecutionContext*);