Fix crash when user closes window prior to the "Confirm Install" prompt showing

chrome/browser/ui/cocoa/extensions/windowed_install_dialog_controller.mm

Index: chrome/browser/ui/cocoa/extensions/windowed_install_dialog_controller.mm
diff --git a/chrome/browser/ui/cocoa/extensions/windowed_install_dialog_controller.mm b/chrome/browser/ui/cocoa/extensions/windowed_install_dialog_controller.mm
index e4e894e9580354aae33176d16c9a0cbe54d82f43..d6f414f6e315aee77d465ee93849b969d376accf 100644
--- a/chrome/browser/ui/cocoa/extensions/windowed_install_dialog_controller.mm
+++ b/chrome/browser/ui/cocoa/extensions/windowed_install_dialog_controller.mm
@@ -7,6 +7,7 @@
 #import "base/mac/sdk_forward_declarations.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/sys_string_conversions.h"
+#include "chrome/browser/extensions/extension_install_prompt_show_params.h"
 #include "chrome/browser/profiles/profile.h"
 #import "chrome/browser/ui/cocoa/extensions/extension_install_view_controller.h"
 #include "content/public/browser/web_contents.h"
@@ -29,13 +30,13 @@
 @end
 
 WindowedInstallDialogController::WindowedInstallDialogController(
-    const ExtensionInstallPrompt::ShowParams& show_params,
+    ExtensionInstallPromptShowParams* show_params,
     ExtensionInstallPrompt::Delegate* delegate,
     scoped_refptr<ExtensionInstallPrompt::Prompt> prompt)
     : delegate_(delegate) {
   install_controller_.reset([[WindowedInstallController alloc]
-      initWithProfile:show_params.profile
-            navigator:show_params.parent_web_contents
+      initWithProfile:show_params->profile()
+            navigator:show_params->GetParentWebContents()
              delegate:this
                prompt:prompt]);
   [[install_controller_ window] makeKeyAndOrderFront:nil];