DevTools: Do not close devtools if there are dirty files in workspace

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index 7aa35da44a634db564ac5d9a95e6fc081c400392..d1b326ab4331e98ae864a0c0aa0bfb392119a168 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1430,6 +1430,10 @@ gfx::Rect Browser::GetRootWindowResizerRect() const {
 void Browser::BeforeUnloadFired(WebContents* web_contents,
                                 bool proceed,
                                 bool* proceed_to_fire_unload) {
+  if (is_devtools() && DevToolsWindow::HandleBeforeUnload(web_contents,
+        proceed, proceed_to_fire_unload))
+    return;
+
   if (IsFastTabUnloadEnabled()) {
     *proceed_to_fire_unload =
         fast_unload_controller_->BeforeUnloadFired(web_contents, proceed);