Coalesce event router Init calls into their constructors.

chrome/browser/extensions/browser_event_router.h

Index: chrome/browser/extensions/browser_event_router.h
diff --git a/chrome/browser/extensions/browser_event_router.h b/chrome/browser/extensions/browser_event_router.h
index 1a7e156f9b25b9f23d8dce4159fdabc3e76a4354..c6064e99c552078b7f515f3ec9214e1bb39afff4 100644
--- a/chrome/browser/extensions/browser_event_router.h
+++ b/chrome/browser/extensions/browser_event_router.h
@@ -35,9 +35,6 @@ class BrowserEventRouter : public TabStripModelObserver,
   explicit BrowserEventRouter(Profile* profile);
   virtual ~BrowserEventRouter();
 
-  // Must be called once. Subsequent calls have no effect.
-  void Init();
-
   // chrome::BrowserListObserver
   virtual void OnBrowserAdded(Browser* browser) OVERRIDE;
   virtual void OnBrowserRemoved(Browser* browser) OVERRIDE;
@@ -154,8 +151,6 @@ class BrowserEventRouter : public TabStripModelObserver,
 
   content::NotificationRegistrar registrar_;
 
-  bool initialized_;
-
   // Maintain some information about known tabs, so we can:
   //
   //  - distinguish between tab creation and tab insertion