Revert "Code model: Update on changes from the versioning system."

This reverts commit 7aa2411693.
It breaks the code model updates completely. So reverting this change
until we have the right thing.

Reviewed-by: Roberto Raggi

src/plugins/git/gitversioncontrol.h

@@ -57,8 +57,6 @@ public:
     virtual bool vcsAdd(const QString &fileName);
     virtual bool vcsDelete(const QString &filename);
 
-    void emitFilesChanged(const QStringList &);
-
 signals:
     void enabledChanged(bool);