Update to Chromium revision 6e53600d (#386251)

- Remove |accept_lang| parameter from CefJSDialogHandler::OnJSDialog
  and CefFormatUrlForSecurityDisplay (see https://crbug.com/336973#c36).
- Remove remaining NPAPI-related code including functions from
  cef_web_plugin.h (see https://crbug.com/493212#c55).
- Mac: 10.7+ deployment target is now required for client applications.
- Mac: Remove CefBrowserHost::SetWindowVisibility (issue #1375). No
  replacement is required for windowed rendering. Use WasHidden for
  off-screen rendering.
- Windows: Visual Studio 2015 Update 2 is now required when building
  CEF/Chromium.

libcef/browser/menu_manager.h

@@ -10,7 +10,6 @@
 
 #include "libcef/browser/menu_runner.h"
 
-#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/common/context_menu_params.h"
@@ -27,7 +26,7 @@ class CefMenuManager : public CefMenuModelImpl::Delegate,
                        public content::WebContentsObserver {
  public:
   CefMenuManager(CefBrowserHostImpl* browser,
-                 scoped_ptr<CefMenuRunner> runner);
+                 std::unique_ptr<CefMenuRunner> runner);
   ~CefMenuManager() override;
 
   // Delete the runner to free any platform constructs.
@@ -63,7 +62,7 @@ class CefMenuManager : public CefMenuModelImpl::Delegate,
   // CefBrowserHostImpl pointer is guaranteed to outlive this object.
   CefBrowserHostImpl* browser_;
 
-  scoped_ptr<CefMenuRunner> runner_;
+  std::unique_ptr<CefMenuRunner> runner_;
 
   CefRefPtr<CefMenuModelImpl> model_;
   content::ContextMenuParams params_;