UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3472.3 Safari/537.36

Steps to reproduce the problem:
1. Use the new ExtensionSettings policy in a blacklist mode.
2. Put a 'blocked_install_message' in the '*' default.
3. Block an extension directly by identifier.
4. The blocked install message is not shown for the blocked extension

Example policy:
ExtensionSettings: {'*' => {'installation_mode': 'allowed', 'blocked_install_message': 'Please contact security@example.com for approval.'}, 'kbfnbcaeplbcioakkpcpgfkobkghlhen': {'installation_mode': 'blocked'}}

What is the expected behavior?
Blocked install message in the '*' default applies as the default to blocked extensions.

What went wrong?
This isn't really an issue if you're operating in a whitelist mode, but if you're operating in a blacklist mode then currently the way to show a blocked message for each extension requires that text to be included with every single blocked extension.

It's not very hard to generate this programmatically, but it can result in an absurdly long policy here.  Additionally, many administrators may be hand editing this policy, so copying and pasting the same text over and over isn't so great.

I would like to have the ability to have customized text per extension as is currently possible, but also avoid shipping the same text hundreds or thousands of times because it has to be bundled for every single blocked extension.

Did this work before? No 

Chrome version: 69.0.3472.3  Channel: dev
OS Version: OS X 10.14.0
Flash Version: