Remove unnecessary method from Browser object.

mandoline/ui/browser/browser.h

Index: mandoline/ui/browser/browser.h
diff --git a/mandoline/ui/browser/browser.h b/mandoline/ui/browser/browser.h
index b07f36317505c22194d1737fe70ef3b520720b53..f158e29a300817b2631c42a9b83979109e3265f5 100644
--- a/mandoline/ui/browser/browser.h
+++ b/mandoline/ui/browser/browser.h
@@ -5,7 +5,6 @@
 #ifndef MANDOLINE_UI_BROWSER_BROWSER_H_
 #define MANDOLINE_UI_BROWSER_BROWSER_H_
 
-#include "base/memory/weak_ptr.h"
 #include "components/view_manager/public/cpp/view_manager.h"
 #include "components/view_manager/public/cpp/view_manager_delegate.h"
 #include "components/window_manager/window_manager_app.h"
@@ -34,8 +33,6 @@ class Browser : public mojo::ApplicationDelegate,
   Browser();
   ~Browser() override;
 
-  base::WeakPtr<Browser> GetWeakPtr();
-
   void ReplaceContentWithURL(const mojo::String& url);
 
   mojo::View* content() { return content_; }
@@ -95,8 +92,6 @@ class Browser : public mojo::ApplicationDelegate,
 
   scoped_ptr<BrowserUI> ui_;
 
-  base::WeakPtrFactory<Browser> weak_factory_;
-
   DISALLOW_COPY_AND_ASSIGN(Browser);
 };