Disable extensions besides externally installed ones and themes.

chrome/browser/views/frame/browser_view.cc

Index: chrome/browser/views/frame/browser_view.cc
diff --git a/chrome/browser/views/frame/browser_view.cc b/chrome/browser/views/frame/browser_view.cc
index ea96ac14e285a9713fe41b31cefc711757367a0b..5dc9a2cf71bf9d2805bac48502ede853e43856e6 100644
--- a/chrome/browser/views/frame/browser_view.cc
+++ b/chrome/browser/views/frame/browser_view.cc
@@ -1412,11 +1412,8 @@ void BrowserView::Init() {
 
   status_bubble_.reset(new StatusBubbleViews(GetWidget()));
 
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableExtensions)) {
-    extension_shelf_ = new ExtensionShelf(browser_.get());
-    AddChildView(extension_shelf_);
-  }
+  extension_shelf_ = new ExtensionShelf(browser_.get());
+  AddChildView(extension_shelf_);
 
 #if defined(OS_WIN)
   InitSystemMenu();