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/coreplugin/mainwindow.cpp

@@ -126,7 +126,7 @@ MainWindow::MainWindow() :
     m_progressManager(new ProgressManagerPrivate()),
     m_scriptManager(new ScriptManagerPrivate(this)),
     m_variableManager(new VariableManager(this)),
-    m_vcsManager(new VCSManager),
+    m_vcsManager(new VCSManager()),
     m_viewManager(0),
     m_modeManager(0),
     m_mimeDatabase(new MimeDatabase),
@@ -346,7 +346,6 @@ void MainWindow::extensionsInitialized()
     OutputPaneManager::instance()->init();
 
     m_actionManager->initialize();
-    m_vcsManager->extensionsInitialized();
     readSettings();
     updateContext();