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/net/devtools_scheme_handler.cc

@@ -9,6 +9,7 @@
 #include "libcef/browser/net/internal_scheme_handler.h"
 #include "libcef/browser/net/url_request_manager.h"
 
+#include "base/memory/ptr_util.h"
 #include "base/strings/string_util.h"
 #include "content/public/common/url_constants.h"
 #include "grit/devtools_resources_map.h"
@@ -49,8 +50,7 @@ void RegisterChromeDevToolsHandler(CefURLRequestManager* request_manager) {
   request_manager->AddFactory(
       content::kChromeDevToolsScheme,
       kChromeDevToolsHost,
-      CreateInternalHandlerFactory(
-          make_scoped_ptr<InternalHandlerDelegate>(new Delegate())));
+      CreateInternalHandlerFactory(base::WrapUnique(new Delegate())));
 }
 
 }  // namespace scheme