Remove custom retry map for exponential retries.

[benbowler]

Summary

Addresses issue #2688

Relevant technical choices

Checklist

• My code is tested and passes existing unit tests.
• My code has an appropriate set of unit tests which all pass.
• My code is backward-compatible with WordPress 4.7 and PHP 5.6.
• My code follows the WordPress coding standards.
• My code has proper inline documentation.
• I have added a QA Brief on the issue linked above.
• I have signed the Contributor License Agreement (see https://cla.developers.google.com/).

[eugene-manuilov]

@benbowler changing the version manually in the composer.json file is not enough because in this case the composer.lock file remains the same. We need to update the dependency version correctly which will mean that the lock file should be updated as well.

Just run composer remove google/apiclient to remove the existing version and run composer require google/apiclient to install the latest one. It will correctly update composer.json and composer.lock files.

[benbowler]

Good point, I failed to commit the composer.lock. Pushed up now.

[eugene-manuilov]

Awesome! LGTM.

[felixarntz]

Great!