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We do this by wrapping the default ctor in a factory Create method, which handles the build-type logic.

Also, group static methods in variations_service.*.
Also, move the testing constructor to protected where it's better... protected.

BUG=162417
TEST=With an unofficial build: Ensure that running Chromium without a command line argument does not result in a request to the Variations server (https://clients4.google.com/chrome-variations/seed). Ensure that providing the --variations-server-url flag with a URL results in a request to that URL.

Review URL: https://chromiumcodereview.appspot.com/11753014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@175352 0039d316-1c4b-4281-b951-d872f2087c98