Support an --install-from-webstore command line switch

chrome/browser/extensions/extension_install_dialog.cc

Index: chrome/browser/extensions/extension_install_dialog.cc
diff --git a/chrome/browser/extensions/extension_install_dialog.cc b/chrome/browser/extensions/extension_install_dialog.cc
index 71fa908bdc67ca3bc9c8b334e6d0a7fa0c54fcc2..a3cd87bf911ec99916e8988d0b5bd51e1665fcee 100644
--- a/chrome/browser/extensions/extension_install_dialog.cc
+++ b/chrome/browser/extensions/extension_install_dialog.cc
@@ -68,9 +68,5 @@ void ShowExtensionInstallDialog(gfx::NativeWindow parent,
     DoAutoConfirm(auto_confirm, delegate);
     return;
   }
-  if (!parent) {
-    delegate->InstallUIAbort(false);

[asargent_no_longer_on_chrome, 2012/09/07 21:15:41]

FYI, I know for sure that GTK's ShowExtensionInstallDialogImpl properly handles
this case of the parent window being NULL, and I am currently verifying that
MacOS/Windows/ChromeOS work as well. If any of them have problems, I can turn
this into an #ifdef for the ones that currently work, and do follow-up CL's to
fix the broken ones. 

[Mihai Parparita -not on Chrome, 2012/09/07 22:01:36]

OK. We end up using in Widget::CreateWindowWithParent in the views version, but
since the parent-less version just calls that with a NULL parent, I think it
should work.

-    return;
-  }
   ShowExtensionInstallDialogImpl(parent, navigator, delegate, prompt);
 }