Move ZoomObserver, ZoomController and ZoomEventManager to components/.

chrome/browser/extensions/api/tabs/tabs_event_router.h

Index: chrome/browser/extensions/api/tabs/tabs_event_router.h
diff --git a/chrome/browser/extensions/api/tabs/tabs_event_router.h b/chrome/browser/extensions/api/tabs/tabs_event_router.h
index 492607856d4a2981edcdc7358979056bc171ba28..f34e98722eb8c95aba91c8609fb0fdc42011c105 100644
--- a/chrome/browser/extensions/api/tabs/tabs_event_router.h
+++ b/chrome/browser/extensions/api/tabs/tabs_event_router.h
@@ -13,9 +13,9 @@
 #include "chrome/browser/extensions/api/tabs/tabs_api.h"
 #include "chrome/browser/ui/browser_list_observer.h"
 #include "chrome/browser/ui/tabs/tab_strip_model_observer.h"
-#include "chrome/browser/ui/zoom/zoom_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/ui/zoom/zoom_observer.h"
 
 namespace content {
 class WebContents;