diff --git a/chrome/browser/chrome_browser_application_mac.h b/chrome/browser/chrome_browser_application_mac.h
index 286f9da5e1bf5..9cdbe4b220b26 100644
--- a/chrome/browser/chrome_browser_application_mac.h
+++ b/chrome/browser/chrome_browser_application_mac.h
@@ -24,6 +24,7 @@
 // application, i.e., begins a process which may lead to termination. This
 // method cancels that process.
 - (void)cancelTerminate:(id)sender;
+- (void)closeAllWindowsQuit:(id)sender;
 
 // Keep track of whether windows are being cycled for use in determining whether
 // a Panel window can become the key window.
diff --git a/chrome/browser/chrome_browser_application_mac.mm b/chrome/browser/chrome_browser_application_mac.mm
index 9e83d57314204..5fbcbf000c4d0 100644
--- a/chrome/browser/chrome_browser_application_mac.mm
+++ b/chrome/browser/chrome_browser_application_mac.mm
@@ -4,6 +4,8 @@
 
 #import "chrome/browser/chrome_browser_application_mac.h"
 
+#include "chrome/browser/apps/platform_apps/app_window_registry_util.h"
+
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ -222,6 +224,11 @@ + (NSApplication*)sharedApplication {
 // the NSApplicationWillTerminateNotification to be posted, which ends the
 // NSApplication event loop, so final post- MessageLoop::Run() work is done
 // before exiting.
+
+- (void)closeAllWindowsQuit:(id)sender {
+  AppWindowRegistryUtil::CloseAllAppWindows(true);
+}
+
 - (void)terminate:(id)sender {
   AppController* appController = static_cast<AppController*>([NSApp delegate]);
   [appController tryToTerminateApplication:self];