GitLab

Transforms HashedExtensionMetrics into a metrics::MetricsProvider, eliminating
direct knowledge of this class from MetricsLog. Renames the class to
ExtensionsMetricsProvider. Notably, changes the class to take in the
MetricsStateManager and later obtain the client ID from the manager rather than
directly taking in the ID; this change is necessary because the provider
instance is now constructed before the ID is determined.

BUG=374225

Review URL: https://codereview.chromium.org/297483008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272633 0039d316-1c4b-4281-b951-d872f2087c98