Add a new webstorePrivate API to show a permission prompt for delegated installs

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 826d9a82aac1f1b7f2b7ed0dace6acb6fc3442e6..82e86b4b071af9f3b43cbe95143c6915020eb56e 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4248,6 +4248,9 @@ Even if you have downloaded files from this website before, the website might ha
       <message name="IDS_EXTENSION_REMOTE_INSTALL_EXTENSION_PROMPT_TITLE" desc="Titlebar of the extension installation prompt window when an app was installed remotely">
         Confirm New Extension
       </message>
+      <message name="IDS_EXTENSION_DELEGATED_INSTALL_PROMPT_TITLE" desc="Titlebar of the extension or app delegated installation prompt window">
+        Confirm Installation for <ph name="USER_NAME">$1<ex>Wallace</ex></ph>

[not at google - send to devlin, 2015/02/04 21:28:28]

Is there any reason not to be consistent and say "Confirm New Extension for
..."?

[Marc Treib, 2015/02/05 10:33:37]

Ah, I was looking at IDS_EXTENSION_INSTALL_PROMPT_TITLE (which is "Confirm
installation"), but apparently that's only used for bundle installs.
So, done.

+      </message>
       <message name="IDS_EXTENSION_INSTALL_PROMPT_HEADING" desc="First bold line in the content area of the extension or app installation prompt. Asks the user if they want to install a particular extension or app.">
         Add "<ph name="EXTENSION_NAME">$1<ex>Gmail Checker</ex></ph>"?
       </message>