GitLab

LanguageUsageMetrics is moved to its own component because it is used
both in the translate component and directly in the browser.

TranslateBrowserMetrics is moved to the translate component.

BUG=331509
TBR=jochen

Review URL: https://codereview.chromium.org/131203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243946 0039d316-1c4b-4281-b951-d872f2087c98